Toyota Avalon (XX50): Fail-safe Chart

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Power Source, Network / Networking / Can Communication System(for Gasoline Model) / Fail-safe Chart

FAIL-SAFE CHART

FAIL-SAFE FUNCTION

(a) When communication fails in any of the CAN bus lines (communication lines), a fail-safe function(s) will operate. The fail-safe function that is specified for each system operates to prevent those systems from malfunctioning.

(b) The following table shows the effects on each system when communication is impossible. (For further details, see the pages for each system.)

Function	Control Master (Main ECU to determine controls)	System Related	Fail-safe Operation	Driver Detectable	DTC Detection (ECU that stored DTC)
Vehicle Stability Control Prevents the vehicle from skidding when the steering wheel is turned abruptly by the driver when on highways, snowy roads, etc.	Brake actuator assembly	ECM Steering sensor Airbag ECU assembly	Control stops.	Brake warning light / red (malfunction) illuminates. ABS warning light illuminates. Slip indicator light illuminates. Brake hold operated indicator light blinks. Displays messages on the multi-information display.	U0073 (Brake actuator assembly)
	Brake actuator assembly	ECM Steering sensor Airbag ECU assembly	Control stops.	Slip indicator light illuminates. Brake hold operated indicator light blinks. Displays messages on the multi-information display.	U0100 U0123 U0126 (Brake actuator assembly)
Traction Control Controls torque to ensure vehicle stability and traction. This control uses the engine speed and accelerator pedal position.	Brake actuator assembly	ECM Steering sensor Airbag ECU assembly	Control stops.	Brake warning light / red (malfunction) illuminates. ABS warning light illuminates. Slip indicator light illuminates. Brake hold operated indicator light blinks. Displays messages on the multi-information display.	U0073 (Brake actuator assembly)
	Brake actuator assembly	ECM Steering sensor Airbag ECU assembly	Control stops.	Slip indicator light illuminates. Brake hold operated indicator light blinks. Displays messages on the multi-information display.	U0100 U0123 U0126 (Brake actuator assembly)
Anti-lock Brake System Control Avoids wheel lockup to assist vehicle stability when the brake pedal is fully depressed.	Brake actuator assembly	-	Only electric brake force distribution control is available.	Brake warning light / red (malfunction) illuminates. ABS warning light illuminates. Slip indicator light illuminates. Brake hold operated indicator light blinks. Displays messages on the multi-information display.	U0073 (Brake actuator assembly)
Hill-start Assist Control Maintains brake torque in order to prevent the vehicle from rolling backwards when stopped on an uphill road.	Brake actuator assembly	ECM Steering sensor Airbag ECU assembly	Control stops.	Brake warning light / red (malfunction) illuminates. ABS warning light illuminates. Slip indicator light illuminates. Brake hold operated indicator light blinks. Displays messages on the multi-information display.	U0073 (Brake actuator assembly)
	Brake actuator assembly	ECM Steering sensor Airbag ECU assembly	Control stops.	Slip indicator light illuminates. Brake hold operated indicator light blinks. Displays messages on the multi-information display.	U0100 U0123 U0126 (Brake actuator assembly)
Pre-collision System Applies the brakes based on information from the radar/camera system in order to avoid a collision.	Brake actuator assembly	Driving support ECU assembly	Control stops.	Brake warning light / red (malfunction) illuminates. ABS warning light illuminates. Slip indicator light illuminates. Brake hold operated indicator light blinks. Displays messages on the multi-information display.	U0073 (Brake actuator assembly)
Dynamic Radar Cruise Control System Applies the brakes to maintain an appropriate distance with the preceding vehicle.	Brake actuator assembly	ECM	Control stops.	Brake warning light / red (malfunction) illuminates. ABS warning light illuminates. Slip indicator light illuminates. Brake hold operated indicator light blinks. Displays messages on the multi-information display.	U0073 (Brake actuator assembly)
Secondary Collision Control System Applies the brakes to decelerate the vehicle after detecting a collision and to prevent or reduce the impact of a secondary collision.	Brake actuator assembly	Airbag ECU assembly	Secondary collision control system is disabled.	Brake warning light / red (malfunction) illuminates. ABS warning light illuminates. Slip indicator light illuminates. Brake hold operated indicator light blinks. Displays messages on the multi-information display.	U0073 (Brake actuator assembly)
	Brake actuator assembly	Airbag ECU assembly	Secondary collision control system is disabled.	Displays messages on the multi-information display.	U0151 (Brake actuator assembly)
Intelligent Clearance Sonar System Applies the brakes in accordance with data sent by the millimeter wave radar sensor assembly or forward recognition camera to prevent the vehicle from accelerating from a stop when the accelerator pedal is depressed by mistake.	Brake actuator assembly	Clearance warning ECU assembly	Control stops.	Brake warning light / red (malfunction) illuminates. ABS warning light illuminates. Slip indicator light illuminates. Brake hold operated indicator light blinks. Displays messages on the multi-information display.	U0073 (Brake actuator assembly)
Brake Hold Function Maintains the brake fluid pressure in order to keep the vehicle stationary when the brake pedal is released when the vehicle is stationary.	Brake actuator assembly	ECM Steering sensor Airbag ECU assembly Main body ECU (multiplex network body ECU)	Control stops.	Brake warning light / red (malfunction) illuminates. ABS warning light illuminates. Slip indicator light illuminates. Brake hold operated indicator light blinks. Displays messages on the multi-information display.	U0073 (Brake actuator assembly)
	Brake actuator assembly		Control stops.	Brake hold operated indicator light blinks.	U0100 U0123 U0126 U0142 (Brake actuator assembly)
Electric Parking Brake System (Drive Away Release Operation) Automatically disengages the electric parking brake system when the accelerator pedal is depressed.	Brake actuator assembly	ECM Airbag ECU assembly Main body ECU (multiplex network body ECU)	Control stops.	Brake warning light / red (malfunction) illuminates. ABS warning light illuminates. Slip indicator light illuminates. Brake hold operated indicator light blinks. Displays messages on the multi-information display.	U0073 (Brake actuator assembly)
	Brake actuator assembly		Control stops.	Brake warning light / yellow illuminates.	U0100 U0123 U0142 (Brake actuator assembly)
Electric Parking Brake System (Shift Synchronized Operation) Locks/Releases the electric parking brake when the driver changes the shift position.	Brake actuator assembly	ECM	Control stops.	Brake warning light / red (malfunction) illuminates. ABS warning light illuminates. Slip indicator light illuminates. Brake hold operated indicator light blinks. Displays messages on the multi-information display.	U0073 (Brake actuator assembly)
	Brake actuator assembly	ECM	Control stops.	Brake warning light / yellow illuminates.	U0100 (Brake actuator assembly)
Occupant Classification System Acquires information about passengers for deployment of SRS components.	Airbag ECU assembly	Occupant detection ECU	SRS components do not deploy.	SRS warning light illuminates.	U0154 (Airbag ECU assembly)
Occupant Detection	Occupant detection ECU	Brake actuator assembly Airbag ECU assembly	Sends signals indicating a malfunction to the airbag ECU assembly.	SRS warning light illuminates.	U0125 U0129 (Occupant detection ECU)
Vehicle Speed Display	Combination meter assembly	Brake actuator assembly	Speedometer is controlled based on a default vehicle speed of 0 km/h (0 mph).	Brake warning light / red (malfunction) illuminates. ABS warning light illuminates. VSC OFF indicator light illuminates.	U012987 (Combination meter assembly)
Tachometer Display	Combination meter assembly	ECM	Needle of tachometer remains at 0 rpm.	MIL illuminates.	U010087 (Combination meter assembly)
Meter Display Displays vehicle condition and controls indicator lights.	Combination meter assembly	Rack and pinion power steering gear assembly Main body ECU (multiplex network body ECU) Airbag ECU assembly Forward recognition camera Radio and display receiver assembly Blind spot monitor sensor RH Air conditioning amplifier assembly Certification ECU (smart key ECU assembly) ECM Steering sensor Clearance warning ECU assembly Brake actuator assembly Meter mirror sub-assembly DCM (Telematics transceiver) Absorber control ECU Headlight ECU sub-assembly LH	Vehicle information is not displayed.	Abnormal light operation	U013187 U014287 U015187 U016387 U016487 U018287 U023387 U023A87 U032787 U110687 U111087 U111287 U113387 (Combination meter assembly)
Speedometer Displays the current vehicle speed.	Meter mirror sub-assembly	Combination meter assembly	Vehicle speed value: 0 is displayed. Vehicle speed unit: Is not displayed.	-	U015587 (Meter mirror sub-assembly)
Display Brightness Adjustment Adjusts the brightness of the display.	Meter mirror sub-assembly	Combination meter assembly	The last valid state is maintained.	-	U015587 (Meter mirror sub-assembly)
Display Position Adjustment Adjusts the position of the display.	Meter mirror sub-assembly	Combination meter assembly	The last valid state is maintained.	-	U015587 (Meter mirror sub-assembly)
Display Rotation Adjustment Adjusts the rotation of the display.	Meter mirror sub-assembly	Combination meter assembly	The last valid state is maintained.	-	U015587 (Meter mirror sub-assembly)
Tachometer Displays the engine speed.	Meter mirror sub-assembly	ECM	The tachometer in the headup display displays an engine speed of 0 rpm.	-	U010087 (Meter mirror sub-assembly)
Eco Driving Indicator Displays the Eco driving indicator.	Meter mirror sub-assembly	ECM	Stops displaying the ECO display. (ECO OFF)	-	U010087 (Meter mirror sub-assembly)
Shift Position Display Displays the shift position.	Meter mirror sub-assembly	ECM	Not displayed.	-	U010087 (Meter mirror sub-assembly)
Pre-collision System Displays warning notifications.	Meter mirror sub-assembly	Driving support ECU assembly	Not displayed.	-	U110487 (Meter mirror sub-assembly)
Dynamic Radar Cruise Control System Displays an icon representing the preceding vehicle, set vehicle-to-vehicle distance and set speed.	Meter mirror sub-assembly	ECM	Not displayed.	-	U010087 (Meter mirror sub-assembly)
Lane Departure Alert System Displays the left and right road marking icons, steering icon and rest reminder icon.	Meter mirror sub-assembly	Forward recognition camera	Not displayed.	-	U023A87 (Meter mirror sub-assembly)
Intelligent Clearance Sonar System Displays the operation status of the intelligent clearance warning system.	Meter mirror sub-assembly	Clearance warning ECU assembly	Not displayed.	-	U111087 (Meter mirror sub-assembly)
Information Hides information icons and messages.	Meter mirror sub-assembly	Combination meter assembly	Not displayed.	-	U015587 (Meter mirror sub-assembly)
Air Conditioning Control Corrects engine speed, such as for idle up. Controls outlet air temperature, outlet mode change and airflow volume based on engine coolant temperature signal. Corrects engine coolant temperature map and changes compressor lock judgment value.	Air conditioning amplifier assembly	ECM	Control is performed based on default coolant temperature of 80°C (176°F).	-	U0100 (Air conditioning amplifier assembly)
Compressor Control Judges compressor lock according to engine speed.	Air conditioning amplifier assembly	ECM	Control is performed based on default engine speed of 0 rpm.	-	U0100 (Air conditioning amplifier assembly)
Panel Dimming Control Outputs dimming information to the A/C panel according to the display dimming information.	Air conditioning amplifier assembly	Main body ECU (multiplex network body ECU)	While the engine switch is on (IG), previous values are maintained (during a reset, dimming control is performed).	-	U0142 (Air conditioning amplifier assembly)
Ambient Temperature Correction Control Switches air conditioning system operation condition and corrects value of displayed ambient temperature according to vehicle speed signal.	Air conditioning amplifier assembly	Combination meter assembly	Control is performed based on default vehicle speed of 0 km/h (0 mph).	-	U0155 (Air conditioning amplifier assembly)
Entry Function Entry lock/unlock, entry luggage compartment open. Warning Performs entry illumination (Interior illumination etc.). Engine Start Enabled Display	Main body ECU (multiplex network body ECU) Certification ECU (smart key ECU assembly)	Main body ECU (multiplex network body ECU) Combination meter assembly ECM	Attempts another unlock operation.	Warning functions (Key confinement, Key not in vehicle, Key reminder etc.) do not operate, Engine start enabled display does not operate, Key confinement prevention control does not operate. Entry lock/unlock or entry luggage compartment open does not operate. Entry illumination does not operate. Wrong entry warning is output. Answer back occurs in succession (A maximum of 3 times).	U0100 U0142 U0155 (Certification ECU (smart key ECU assembly))
Wireless Function Operates the wireless lock/unlock functions.	Main body ECU (multiplex network body ECU)	Certification ECU (smart key ECU assembly)	-	Wireless lock/unlock functions and luggage compartment opener can be operated when the engine switch is on (IG).	U0142 (Certification ECU (smart key ECU assembly))
Security Indicator Display Function Displays the immobiliser security condition.	Certification ECU (smart key ECU assembly)	Main body ECU (multiplex network body ECU)	-	Security condition cannot display normally (illuminates during security warning preparation/security warning). Entry and start warning cannot display normally. When the engine is started, the message to show how to start the engine does not turn off immediately. When the engine is started, the low electrical key transmitter sub-assembly battery warning is not displayed.	U0142 (Certification ECU (smart key ECU assembly))
Engine Start/Stop Switch (Power Source Mode Change) Changes the power source mode and outputs a start signal based on the operation of the switch.	Certification ECU (smart key ECU assembly)	Main body ECU (multiplex network body ECU) ECM Combination meter assembly	-	A message urging engine start operation is not displayed when required. Engine switch indicator blinks.	U0100 U0140 U0155 (Certification ECU (smart key ECU assembly))
Electric Load Control Performs idle up according to electric load.	ECM	Air conditioning amplifier assembly Rack and pinion power steering gear assembly Main body ECU (multiplex network body ECU)	Idle up according to electric load is not performed.	Engine idle speed changes.	-
Air Conditioning Cooperative Operation Performs idle up according to compressor load. Performs air conditioning cut control.	ECM	Air conditioning amplifier assembly	Air conditioning system does not use cooperative controls. (Idle up is not performed.)	Air conditioning system does not operate.	-
PTC Heater Performs idle up when there is a heat demand signal that requires operation of the PTC heater.	ECM	Air conditioning amplifier assembly	PTC heater does not operate.	Engine idle speed changes. Heating performance deteriorates. PTC heater does not operate.	-
Charge Control Performs idle up according to charging request.	ECM	Air conditioning amplifier assembly Main body ECU (multiplex network body ECU)	Idle up according to charging request is not performed. Charging control is not prohibited. Taillights flicker and blower airflow changes.	Taillights flicker and blower airflow changes.	-
Sprung Mass Damping Control Uses transitional driving force control to improve behavior (pitch, bounce) of sprung vehicle mass when disturbed.	ECM	Brake actuator assembly	Sprung vehicle mass damping control does not operate. Does not use transitional driving force control to improve behavior (pitch, bounce) of sprung vehicle mass when disturbed.	-	-
Integrated Control (VDM) Estimates the driver requested torque based on the accelerator pedal operation and performs torque characteristic control according to driving conditions so that driveability, acceleration performance and acceleration feeling are improved.	ECM	Driving support ECU assembly Brake actuator assembly Airbag ECU assembly Steering sensor	Does not estimate the driver requested torque based on the accelerator pedal operation and does not perform torque characteristic control according to driving conditions and as a result, driveability, acceleration performance and acceleration feeling are not improved.	-	-
Eco Control Adjusts throttle response in consideration of actual fuel economy.	ECM	Air conditioning amplifier assembly	Eco mode does not operate.	-	-
Blind Spot Monitor Control Detects vehicle in blind spot of adjacent lane and informs driver.	Blind spot monitor sensor RH	ECM Airbag ECU assembly Steering sensor Brake actuator assembly Main body ECU (multiplex network body ECU)	-	Displays messages on the multi-information display. Outer rear view mirror indicator illuminates in amber.	U0100 U0125 U0126 U0129 U0142 (Blind spot monitor sensor RH)
Automatic High Beam System Outputs information regarding the detection of the headlights and tail lights of other vehicles by the forward recognition camera to the driving support ECU assembly.	Forward recognition camera	ECM Brake actuator assembly Main body ECU (multiplex network body ECU) Airbag ECU assembly Millimeter wave radar sensor assembly	Performs control based on the signals received before the malfunction occurred.	Displays messages on the multi-information display.	-
LDA/SWS System (Recognizes the lane markers of the lane the vehicle is in using the forward recognition camera and performs the following operations based on the vehicle condition and information captured by the forward recognition camera.) If the system judges that the vehicle may deviate from the lane it is in, the system performs steering assist to help the driver correct the path of the vehicle. If the system judges that the vehicle deviated from the lane it is in, the system sounds a buzzer to inform the driver of lane departure. If the system judges unsteady driving, the system informs the driver to stop and take a rest.	Forward recognition camera	ECM Rack and pinion power steering gear assembly Brake actuator assembly Main body ECU (multiplex network body ECU) Combination meter assembly Airbag ECU assembly Millimeter wave radar sensor assembly Steering sensor Driving support ECU assembly	Control stops.	Lane departure alert indicator (yellow) illuminates. Displays messages on the multi-information display.	U0100 U0101 U0123 U0126 U0129 U0131 U0142 U0155 U0235 U023A U1104 (Forward recognition camera)
Pre-collision System Outputs information regarding the detection of vehicles and pedestrians to the driving support ECU assembly.	Forward recognition camera	ECM Airbag ECU assembly Brake actuator assembly Main body ECU (multiplex network body ECU) Millimeter wave radar sensor assembly Driving support ECU assembly	Detection processing is reset and signals indicating that the forward recognition camera is not detecting objects are sent to the driving support ECU assembly.	PCS warning light illuminates. Displays messages on the multi-information display.	U0100 U0123 U0129 U0142 U0235 U1104 (Forward recognition camera)
Dynamic Radar Cruise Control System Accelerates or decelerates the vehicle to maintain the distance to the vehicle ahead.	ECM	Brake actuator assembly Driving support ECU assembly	Control stops.	Displays messages on the multi-information display.	U010087 U012287 U110487 (ECM)
Dynamic Radar Cruise Control System Assists driving by maintaining a specified time interval between the vehicle and preceding vehicle.	Driving support ECU assembly	Brake actuator assembly Airbag ECU assembly Steering sensor ECM Forward recognition camera Millimeter wave radar sensor assembly	Control stops.	Displays messages on the multi-information display.	U0100 U0125 U0126 U0129 U0235 U1104 (Driving support ECU assembly)
Pre-collision System Performs pre-collision alarm control, pre-collision brake assist control and pre-collision brake control when an obstruction is detected.	Driving support ECU assembly	Millimeter wave radar sensor assembly Forward recognition camera Brake actuator assembly Airbag ECU assembly Steering sensor ECM Driving support ECU assembly Combination meter assembly	Control stops.	PCS warning light illuminates. Displays messages on the multi-information display.	U0100 U0125 U0126 U0129 U0155 U0235 U023A U1002 U1104 (Driving support ECU assembly)
Power Steering Control Calculates assist current according to torque sensor value and vehicle speed and drives motor.	Rack and pinion power steering gear assembly	ECM Brake actuator assembly Airbag ECU assembly Steering sensor	When steering assist is not being performed: Steering assist is controlled at a set amount. When steering assist is being performed: Steering assist is suspended.	EPS warning light illuminates.	U0100 U0129 (Rack and pinion power steering gear assembly)
Assist Map Selection Selects proper assist map according to destination, engine type, etc.	Rack and pinion power steering gear assembly	Main body ECU (multiplex network body ECU) Brake actuator assembly ECM Absorber control ECU	Default map is used to assist because proper assist map cannot be selected. (Steering feel may be different.)	EPS warning light illuminates.	C1581 (Rack and pinion power steering gear assembly)
Auto Location Displays the location and pressure value of all tires on the combination meter assembly.	Tire pressure warning ECU and receiver	Brake actuator assembly	Auto Location function is prohibited.	-	U0129 (Tire pressure warning ECU and receiver)
Door Lock Controls key linked and automatic door lock/unlock function, key confinement prevention function, etc.	Main body ECU (multiplex network body ECU)	Airbag ECU assembly	Key linked door lock/unlock function is performed even when the engine switch is on (IG) and the driver seatbelt is fastened.	-	U0151 (Main body ECU (multiplex network body ECU))
Shift-linked Automatic Door Lock Function Automatically locks all of the doors when the shift lever is moved to select another shift state with park (P) selected.	Main body ECU (multiplex network body ECU)	ECM	All of the doors are not locked automatically when all of the following conditions are met. The engine switch is on (IG), the engine is running and all of the doors are closed. With park (P) selected, the shift lever is moved to select another shift state.	-	U0101 (Main body ECU (multiplex network body ECU))
Shift-linked Automatic Door Unlock Function Automatically unlocks all of the doors when the P position switch (transmission shift main switch) is pushed with a shift state other than park (P) selected.	Main body ECU (multiplex network body ECU)	ECM Combination meter assembly	All of the doors are not locked automatically when all of the following conditions are met. The engine switch is on (IG), the engine is running and all of the doors are closed. With park (P) selected, the shift lever is moved to select another shift state.	-	U0101 U0155 (Main body ECU (multiplex network body ECU))
Speed-sensitive Automatic Door Lock Function Automatically locks all of the doors when the vehicle is determined that the vehicle is being driven.	Main body ECU (multiplex network body ECU)	Combination meter assembly	All of the doors are not locked automatically when all of the following conditions are met. The engine switch is on (IG) and the engine is running. Vehicle speed is higher than approximately 20 km/h (12 mph).	-	U0155 (Main body ECU (multiplex network body ECU))
Manual Unlock Prohibition Function When it is determined that the vehicle is parked and the doors are locked or closed after the driver has left the vehicle, unlocking the vehicle using the door control switch is prohibited.	Main body ECU (multiplex network body ECU)	ECM	The manual unlock prohibition cannot be canceled when the engine has been started.	-	U0100 (Main body ECU (multiplex network body ECU))
Power Door Lock Control System Customize Setting Enables or disables each power door lock or unlock function in accordance with user operation.	Main body ECU (multiplex network body ECU)	ECM	Shift linked automatic lock control does not occur. Automatic lock/unlock cannot be changed.	-	U0101 (Main body ECU (multiplex network body ECU))
Wireless Function Locks and unlocks doors, etc. via remote operation.	Main body ECU (multiplex network body ECU)	Certification ECU (smart key ECU assembly)	The doors cannot be locked or unlocked via remote operation.	-	-
Entry Lock/Unlock Locks or unlocks doors using the entry lock/unlock operation.	Main body ECU (multiplex network body ECU)	Certification ECU (smart key ECU assembly)	The doors cannot be locked or unlocked via remote operation.	-	U0327 (Main body ECU (multiplex network body ECU))
Wireless Door Lock Buzzer Sounds when the doors are locked/unlocked by wireless operation.	Main body ECU (multiplex network body ECU)	Certification ECU (smart key ECU assembly)	The wireless door lock buzzer does not sound when the doors are locked/unlocked by wireless operation.	-	U0327 (Main body ECU (multiplex network body ECU))
Seat and Mirror Control	Main body ECU (multiplex network body ECU)	Position control ECU assembly LH Multiplex tilt and telescopic ECU Outer mirror control ECU assembly LH Outer mirror control ECU assembly RH Brake actuator assembly Combination meter assembly Certification ECU (smart key ECU assembly)	Memory function does not operate.	-	U0155 U0199 U0200 U0208 U0327 U1106 U1115 (Main body ECU (multiplex network body ECU))
Luggage Compartment Door Opener System Unlocks and unlatches the luggage compartment door when the luggage electrical key switch is pushed and held with the luggage compartment door locked.	Main body ECU (multiplex network body ECU)	Certification ECU (smart key ECU assembly)	When the luggage electrical key switch is pushed and held with the luggage compartment door locked, the luggage compartment door does not unlatch.	-	U0327 (Main body ECU (multiplex network body ECU))
Luggage Compartment Door Opener System Unlatches the luggage compartment door when the luggage door opening switch assembly is pushed.	Main body ECU (multiplex network body ECU)	Combination meter assembly ECM	When the luggage door opening switch assembly is pushed and held, the luggage compartment door does not unlatch.	-	U0101 U0155 (Main body ECU (multiplex network body ECU))
Dome Lights Illuminates when approaching any of the doors while holding an entry key.	Main body ECU (multiplex network body ECU)	Certification ECU (smart key ECU assembly)	The interior lights remain off when the electrical key transmitter sub-assembly is close to any of the doors.	-	U0327 (Main body ECU (multiplex network body ECU))
Dimmer Controlled Illumination Dims the illumination of the instrument panel ambient illumination lights or ambient illumination lights when the vehicle starts driving.	Main body ECU (multiplex network body ECU)	ECM	The interior lights remain on without being dimmed when the shift state is park (P) and a shift state other than park (P) is selected.	-	U0101 (Main body ECU (multiplex network body ECU))
Alarm Function In the armed state, the alarm function judges break-in according to changes in door courtesy status and the alarm sounds.	Main body ECU (multiplex network body ECU)	Certification ECU (smart key ECU assembly) ECM	After the vehicle is locked using wireless operation, pressing the push start switch before the alarm is set does not unset the alarm and, after a specified period of time, the alarm will be set. When the alarm is sounding, the alarm is not canceled when the engine has been started.	-	U0100 U0120 (Main body ECU (multiplex network body ECU))
Battery Saving Function When it is determined that the vehicle is parked, stops sending illumination request signals and cuts power to the interior lights to avoid a depleted battery.	Main body ECU (multiplex network body ECU)	Certification ECU (smart key ECU assembly)	When the battery is in battery saving mode and any of the doors are approached while holding an entry key, the battery saving function is not canceled and the interior illuminations do not illuminate.	-	U0327 (Main body ECU (multiplex network body ECU))
Headlight System Malfunction Warning Display Detects an open circuit or a malfunctioning ECU in the LED headlight system and informs the driver of the malfunction.	Main body ECU (multiplex network body ECU)	ECM	When an LED headlight malfunction is detected, the LED headlight warning display is not displayed when the low beam headlights are turned on when the engine has been started.	-	U0100 (Main body ECU (multiplex network body ECU))
Meter Illumination Auto Dimmer Determines whether it is daytime or nighttime based on the automatic light control sensor signals and, when it is determined that it is nighttime or dark, dims the meter illumination according to interior light illuminations and tail cancel switch state.	Main body ECU (multiplex network body ECU)	Combination meter assembly	The meter illumination is dimmed when the tail cancel switch is on.	-	U0155 (Main body ECU (multiplex network body ECU))
Key Off Operation Permits the power window to operate for 43 seconds after the engine switch is turned off.	Main body ECU (multiplex network body ECU)	ECM	The engine speed is set to 0.	Even though the engine is started, power window operation is not permitted.	U0100 (Main body ECU (multiplex network body ECU))
Headlights Left Off Warning Suggests that the driver turns the headlights on when the headlights are not illuminated while driving at night.	Main body ECU (multiplex network body ECU)	Combination meter assembly	The suggestion that the driver turns the headlights on is not displayed on the multi-information display in the combination meter assembly when the headlight dimmer switch is OFF or TAIL while driving at night.	-	U0155 (Main body ECU (multiplex network body ECU))
Automatic High Beam System Controls the high beam automatically when the forward recognition camera detects a preceding vehicle or an oncoming vehicle.	Main body ECU (multiplex network body ECU)	Forward recognition camera Headlight ECU sub-assembly LH	Automatic high beam system does not operate.	Automatic high beam indicator light flashes.	U0182 U023A (Main body ECU (multiplex network body ECU))
Air Conditioning Control Controls air conditioning functions.	Radio and display receiver assembly	Air conditioning amplifier assembly	Air conditioning system indicators turn off. If set temperature is shown on multi-information display or multi-display, set temperature display turns off.	-	U0073 U0164 (Radio and display receiver assembly)
Fuel Consumption Display Displays graph of fuel consumption per minute and history of total fuel consumption.	Radio and display receiver assembly	ECM Brake actuator assembly	The fuel consumption calculation is not performed. The existing data is cleared and the per-minute fuel consumption calculation resumes after normal data is received again. If the fuel consumption display scale signal (FC_SCL) or drive monitor unit signal (UNIT_6) cannot be received from the combination meter assembly, the display shows the last known value.	-	U0073 U0100 U0129 U0155 (Radio and display receiver assembly)
Destination Identification Identifies destination based on destination and destination package information, and selects the time zone and language used for the display.	Radio and display receiver assembly	Main body ECU (multiplex network body ECU)	Determines the destination according to the last received value and operates accordingly (if there is no last received value, the system operates using the default value).	Time zone and language selection screen are different from actual destination.	U0073 U0140 (Radio and display receiver assembly)
Vehicle Customize Function Changes the behavior and control parameters of various functions (illumination lighting time, etc.) according to the user operation via the screen.	Radio and display receiver assembly	Main body ECU (multiplex network body ECU) Air conditioning amplifier assembly Certification ECU (smart key ECU assembly) Position control ECU assembly LH	When an application that uses phase 4 remote communication is activated (customization/remote diagnosis), the process will be performed regardless of main body ECU (multiplex network body ECU) remote communication permit/prohibit state. The enter button is grayed out and selection is not possible. Performs customization according to diagnostic communication Retries 3 times	-	U0073 (Radio and display receiver assembly)
Remote Service Function Notifies the center with information of the user operation such as proceeding to the warning screen, remote immobiliser screen or a screen for using the remote service, via the DCM (telematics transceiver).	Radio and display receiver assembly	DCM (telematics transceiver)	The remote screen is not displayed.	-	U0073 U0198 (Radio and display receiver assembly)
Back Guide Monitor Function Displays the image from the rear view camera with the predicted path guide lines, vehicle width extension guide lines and distance guide lines overlaid when reversing.	Radio and display receiver assembly	ECM Television camera assembly	When in camera diagnostic mode, transitions to the multi-media screen and the camera diagnosis screen starts. When DTC C1610 is stored, current DTC C1610 is cleared. Sends reactive force setting completion notifications and pointer coordinates as a setting signal for each error when it occurs. Treats the camera screen pattern as a setting signal for each error when it occurs, and performs the reactive force setting when the camera image is displayed. When in camera mode, transitions to the multi-media screen and the camera screen.	-	U0073 U0265 (Radio and display receiver assembly)
Meter-linked Function Changes display based on customization information set through the meter. Outputs the customization information set in the system.	Radio and display receiver assembly	Combination meter assembly	Language, unit and accent color linking: Maintains the last valid settings. GS search: Performs control without confirming if there is a GS search request. Uses the last valid settings. Grays out the settings to prevent them from being changed when displayed.	-	U0073 U0155 (Radio and display receiver assembly)
Information Sound Adjustment Function Receives flags from the driving support ECU assembly to operate the alarm, and limits or mutes multimedia audio while the alarm is operating.	Radio and display receiver assembly	Driving support ECU assembly	Audio mute is canceled.	-	U0073 (Radio and display receiver assembly)
Intuitive Parking Assist System Setting Controls the settings for the clearance sonar screen notifications.	Radio and display receiver assembly	Clearance warning ECU assembly	Returns to the previous display.	-	U0073 U1110 (Radio and display receiver assembly)
Panoramic View Monitor	Radio and display receiver assembly	ECM Television camera assembly Parking assist ECU	When in camera diagnostic mode, transitions to the multi-media screen and the camera diagnosis screen starts. When DTC C1610 is stored, current DTC C1610 is cleared. Sends reactive force setting completion notifications and pointer coordinates as a setting signal for each error when it occurs. Treats the camera screen pattern as a setting signal for each error when it occurs, and performs the reactive force setting when the camera image is displayed. When in camera mode, transitions to the multi-media screen and the camera screen.	-	U0073 U023B (Radio and display receiver assembly)
Back Guide Monitor Function Monitors the shift position signal, steering angle signal and vehicle speed, and displays the predicted path guide lines on the screen based on the steering angle when reversing.	Television camera assembly	ECM Main body ECU (multiplex network body ECU) Steering sensor Radio and display receiver assembly Blind spot monitor sensor RH	Control stops. Rear cross traffic alert function information is not displayed in back guide monitor function. Intuitive parking assist system information is not displayed in back guide monitor function. All guide lines, the clearance sonar icon and rear cross traffic alert icon are not displayed. Switches on the screen are grayed out.	"!" is displayed on the camera screen.	U0100 U0126 U0140 U0163 U0233 U1000 (Television camera assembly)
Rear Camera Detection Function Monitors the shift position signal and vehicle speed and displays a warning message on the screen and sounds a buzzer to warn the driver when a pedestrian is detected in the image of the camera when reversing.	Television camera assembly	ECM Brake actuator assembly Blind spot monitor sensor RH Main body ECU (multiplex network body ECU) Steering sensor Clearance warning ECU assembly Radio and display receiver assembly Parking assist ECU	Control stops.	Displays messages on the multi-information display.	U0100 U0126 U0129 U0140 U0163 U0233 U023B U1000 (Television camera assembly)
Panoramic View Monitor Displays the bird's-eye view, rear view, side view and front view of the vehicle on the multi-information display. Displays guide lines on the panoramic view monitor screen. Displays the detection area of the clearance sonar sensors. Displays the detection status of the rear cross traffic alert function. Displays the detection status of each camera.	Parking assist ECU	ECM Steering sensor Brake actuator assembly Main body ECU (multiplex network body ECU) Radio and display receiver assembly Blind spot monitor sensor RH Television camera assembly Clearance warning ECU assembly	Panoramic view monitor system does not operate. Rear cross traffic alert function information is not displayed in panoramic view monitor system. Intuitive parking assist system information is not displayed in panoramic view monitor system. All guide lines, the clearance sonar icon and rear cross traffic alert icon are not displayed. Switches on the screen are grayed out.	"!" is displayed on the camera screen.	U0073 U0100 U0126 U0129 U0140 U0163 U0233 U0265 U1000 U1110 (Parking assist ECU)
Ambient Temperature Display Used for correction of the distance measured using the ultrasonic sensors.	Clearance warning ECU assembly	Air conditioning amplifier assembly	-	-	U0164 (Clearance warning ECU assembly)
Intuitive Parking Assist System Warns the driver when an obstruction is detected by the ultrasonic sensors.	Clearance warning ECU assembly	ECM Steering sensor Brake actuator assembly	Operation of the intuitive parking assist system is suspended.	-	U0073 U0100 U0126 U0129 U1000 (Clearance warning ECU assembly)
Intelligent Clearance Sonar System Controls the driving torque and operates the brakes when a collision is imminent.	Clearance warning ECU assembly	ECM Airbag ECU assembly Steering sensor Brake actuator assembly Blind spot monitor sensor RH Blind spot monitor sensor LH	Intelligent clearance sonar control is suspended.	Displays messages on the multi-information display. Buzzer sounds. ICS OFF indicator light blinks.	U0073 U0100 U0124 U0126 U0129 U0232 U0233 U1000 (Clearance warning ECU assembly)
Remote Check Sends driving distance and remaining fuel information displayed on the combination meter to the service center so that the information can be checked on a cell phone.	DCM (telematics transceiver)	Combination meter assembly	Function is disabled.	Notification displayed on smartphone via the application.	U0155 (DCM (telematics transceiver))
TOYOTA Entune System Vehicle Status Alerts	DCM (telematics transceiver)	Main body ECU (multiplex network body ECU)	Function is disabled.	Notification displayed on smartphone via the application.	U0142 (DCM (telematics transceiver))
TOYOTA Entune System Guest Driver Monitor	DCM (telematics transceiver)	Combination meter assembly Main body ECU (multiplex network body ECU)	Function is disabled.	Notification displayed on smartphone via the application.	U0142 U0155 (DCM (telematics transceiver))
TOYOTA Entune System Remote Door Lock and Unlock	DCM (telematics transceiver)	Main body ECU (multiplex network body ECU)	Function is disabled.	Notification displayed on smartphone via the application.	U0142 (DCM (telematics transceiver))
TOYOTA Entune System Remote Engine Start and Stop	DCM (telematics transceiver)	Main body ECU (multiplex network body ECU)	Function is disabled.	Notification displayed on smartphone via the application.	U0142 (DCM (telematics transceiver))
Mirror Operation Control Controls the operation of the outer mirrors based on signals such as the mirror switch signal from the main body ECU (multiplex network body ECU).	Outer mirror control ECU assembly LH Outer mirror control ECU assembly RH	Main body ECU (multiplex network body ECU)	Manual mirror operation is prohibited.	-	U0142 (Outer mirror control ECU assembly LH) U0142 (Outer mirror control ECU assembly RH)
Reverse-shift Linked Door Mirror Operation Controls the reverse operation of the outer mirrors based on reverse request information from the main body ECU (multiplex network body ECU).	Outer mirror control ECU assembly LH Outer mirror control ECU assembly RH	Main body ECU (multiplex network body ECU)	Reverse-shift linked door mirror function does not operate.	-	-
Mirror Surface Position Memory and Recall Memorizes the mirror surface positions based on the memory request signal from the main body ECU (multiplex network body ECU) and adjusts the outer mirror surfaces to the memorized positions.	Outer mirror control ECU assembly LH Outer mirror control ECU assembly RH	Main body ECU (multiplex network body ECU)	Mirror surface position cannot be memorized or recalled.	-	-
Mirror Heater Control Controls the outer mirror heater in accordance with the main body ECU (multiplex network body ECU) based on the state of the defogger switch, etc.	Outer mirror control ECU assembly LH Outer mirror control ECU assembly RH	Main body ECU (multiplex network body ECU) Air conditioning amplifier assembly	Mirror heaters do not operate.	-	U0142 (Outer mirror control ECU assembly LH) U0142 (Outer mirror control ECU assembly RH)
Mirror Retract/Return Operation Controls retract/return operation of the outer mirrors based on signals such as mirror switch signal from main body ECU (multiplex network body ECU).	Outer mirror control ECU assembly LH Outer mirror control ECU assembly RH	Main body ECU (multiplex network body ECU)	Mirrors cannot be retracted or returned.	-	-
Illumination Control Controls the illumination of the lights in accordance with the main body ECU (multiplex network body ECU).	Outer mirror control ECU assembly LH Outer mirror control ECU assembly RH	Main body ECU (multiplex network body ECU)	Mirror foot light does not illuminate.	-	-
Auto Away Function Moves the steering wheel to the most retracted position and tilts to the top if the system detects the driver side seat belt is unfastened and the engine switch is turned off.	Multiplex tilt and telescopic ECU	Main body ECU (multiplex network body ECU) Combination meter assembly	Control is suspended (manual operation is still possible).	-	U014287 U015587 (Multiplex tilt and telescopic ECU)
Auto Return Function Returns the steering wheel to the position before the auto-away operation was performed (multiplex tilt and telescopic ECU memorized position) when the engine switch is turned ON or the driver side seat belt is fastened.	Multiplex tilt and telescopic ECU	Main body ECU (multiplex network body ECU) Combination meter assembly	Control is suspended (manual operation is still possible).	-	U014287 U015587 (Multiplex tilt and telescopic ECU)
Memory Function Memorizes or recalls the steering wheel position in accordance with the operation of the memory switch.	Multiplex tilt and telescopic ECU	Main body ECU (multiplex network body ECU) Combination meter assembly Position control ECU assembly LH	Control is suspended (manual operation is still possible).	-	U014287 U015587 U020887 (Multiplex tilt and telescopic ECU)
User Customize Function Changes the behavior and control parameters of the auto-away and auto-return functions according to multi-media operation.	Multiplex tilt and telescopic ECU	Main body ECU (multiplex network body ECU) Radio and display receiver assembly	Control is suspended (manual operation is still possible).	-	U014287 (Multiplex tilt and telescopic ECU)
AVS Control Controls the variable damping force according to road and driving conditions.	Absorber control ECU	ECM	Control other than anti-squat control is continued. Control is maintained in "NORMAL" mode.	-	U0100 U0101 (Absorber control ECU)
		Brake actuator assembly	Maintains the fail-safe damping force.	-	U0122 (Absorber control ECU)
		Airbag ECU assembly Steering sensor	Control other than roll control is continued.	-	U0124 U0126 (Absorber control ECU)
Memory Seat Playback Control Controls the memorization and setting of the seat position by controlling corresponding motors in accordance with the main body ECU (multiplex network body ECU).	Position control ECU assembly LH	Main body ECU (multiplex network body ECU)	Control stops.	-	-
Away/Return Control Controls the forward/rearward slide distance of the seat in accordance with the main body ECU (multiplex network body ECU).	Position control ECU assembly LH	Main body ECU (multiplex network body ECU)	Control stops.	-	-
Active Noise Control Reduces engine booming noise and produces realistic engine sounds.	Stereo component equalizer assembly	ECM Main body ECU (multiplex network body ECU) Brake actuator assembly	Restricts the effectiveness of active noise control or prohibits the function.	-	U010087 U012987 U014087 (Stereo component equalizer assembly)
Light control Controls the illumination of the low beams, high beams, daytime running lights and clearance lights.	Headlight ECU sub-assembly LH Headlight ECU sub-assembly RH	Main body ECU (multiplex network body ECU)	High beams: Off (maintains previous value for 3 seconds after stopped). Adaptive high beam system: Stopped (maintains low beam). Daytime running light/clearance light: Left and right clearance lights turned on and left and right daytime running lights turned off.	-	U0142 (Headlight ECU sub-assembly LH) U0142 (Headlight ECU sub-assembly RH)

Dtc Combination Table

Front Camera Module Communication Stop Mode. Headlight ECU LH Communication Stop Mode. Headlight ECU RH Communication Stop Mode

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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Can Communication System(for Hv Model): Open in One Side of Bus 2 Branch Line. Open in One Side of Bus 3 Branch Line. Open in One Side of Bus 4 Branch Line
Open in One Side of Bus 2 Branch Line DESCRIPTION When the CAN bus main lines are normal (no open, short to ground, short to +B or short between lines) and there is an ECU or sensor on the "Communication Bus Check" screen that is indicated as not communicating or whose connection status on the "Comm ...