Toyota Avalon (XX50): Clearance Warning ECU Communication Stop Mode. Data List / Active Test. DCM Communication Stop Mode

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Power Source, Network / Networking / Can Communication System(for Gasoline Model) / Clearance Warning ECU Communication Stop Mode. Data List / Active Test. DCM Communication Stop Mode

Clearance Warning ECU Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
Clearance Warning ECU Communication Stop Mode	Any of the following conditions are met: Communication stop for "Clearance Warning (Intuitive Parking Assist)" is indicated on the "Communication Bus Check" screen of the Techstream. Click here Communication stop history for "Clearance Warning (Intuitive Parking Assist)" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "Clearance Warning (Intuitive Parking Assist)" is 6 or more.) Click here Communication system DTCs (DTCs that start with U) that correspond to "Clearance Warning ECU Communication Stop Mode" in "DTC Combination Table" are output. Click here	Clearance warning ECU assembly branch line or connector Power source circuit of clearance warning ECU assembly Clearance warning ECU assembly ground circuit Clearance warning ECU assembly

Detection Item

Symptom

Trouble Area

Clearance Warning ECU Communication Stop Mode

Any of the following conditions are met:

Communication stop for "Clearance Warning (Intuitive Parking Assist)" is indicated on the "Communication Bus Check" screen of the Techstream.
Click here
Communication stop history for "Clearance Warning (Intuitive Parking Assist)" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "Clearance Warning (Intuitive Parking Assist)" is 6 or more.)
Click here
Communication system DTCs (DTCs that start with U) that correspond to "Clearance Warning ECU Communication Stop Mode" in "DTC Combination Table" are output.
Click here

Clearance warning ECU assembly branch line or connector
Power source circuit of clearance warning ECU assembly
Clearance warning ECU assembly ground circuit
Clearance warning ECU assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

NOTICE:

Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.
Click here
Before measuring the resistance of the CAN bus, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
Click here
After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the engine switch on (IG) and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.
After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.
Click here
Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

PROCEDURE

1.	CHECK FOR OPEN IN CAN BUS LINES (CLEARANCE WARNING ECU ASSEMBLY BRANCH LINE)

(a) Disconnect the cable from the negative (-) battery terminal.

(b) Disconnect the K34 clearance warning ECU assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
K34-17 (R1) - K34-18 (R2)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

*a	Front view of wire harness connector (to Clearance Warning ECU Assembly)

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY)

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
K34-30 (E) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

*a	Front view of wire harness connector (to Clearance Warning ECU Assembly)

(b) Reconnect the cable to the negative (-) battery terminal.

Standard Voltage:

Tester Connection	Condition	Specified Condition
K34-1 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

REPLACE CLEARANCE WARNING ECU ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

Data List / Active Test

DATA LIST / ACTIVE TEST

NOTICE:

In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

HINT:

Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

DATA LIST

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Central Gateway / Data List.

Body Electrical > Central Gateway > Data List

Tester Display
IG2 SW
IG1 SW
ACC SW
+B Voltage
Number of DTC

(e) Read the Data List.

Body Electrical > Central Gateway > Data List

Tester Display	Measurement Item	Range	Normal Condition
IG2 SW	Engine switch on (IG) signal (IG2 terminal)	OFF or ON	OFF: Engine switch on (ACC) or off ON: Engine switch on (IG)
IG1 SW	Engine switch on (IG) signal (IG1 terminal)	OFF or ON	OFF: Engine switch on (ACC) or off ON: Engine switch on (IG)
ACC SW	Engine switch on (ACC) signal (ACC terminal)	OFF or ON	OFF: Engine switch off ON: Engine switch on (ACC) or on (IG)
+B Voltage	Battery voltage (BATT terminal)	Over 8 V or Under 8 V	Over 8 V: Battery voltage 8 V or higher Under 8 V: Battery voltage below 8 V
Number of DTC	Number of DTCs	0 to 255	0: Normal

DCM Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
DCM Communication Stop Mode	Any of the following conditions are met: Communication stop for "DCM" is indicated on the "Communication Bus Check" screen of the Techstream. Click here Communication stop history for "DCM" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "DCM" is 6 or more.) Click here Communication system DTCs (DTCs that start with U) that correspond to "DCM Communication Stop Mode" in "DTC Combination Table" are output. Click here	DCM (telematics transceiver) branch line or connector Power source circuit of DCM (telematics transceiver) DCM (telematics transceiver) ground circuit DCM (telematics transceiver)

Detection Item

Symptom

Trouble Area

DCM Communication Stop Mode

Any of the following conditions are met:

Communication stop for "DCM" is indicated on the "Communication Bus Check" screen of the Techstream.
Click here
Communication stop history for "DCM" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "DCM" is 6 or more.)
Click here
Communication system DTCs (DTCs that start with U) that correspond to "DCM Communication Stop Mode" in "DTC Combination Table" are output.
Click here

DCM (telematics transceiver) branch line or connector
Power source circuit of DCM (telematics transceiver)
DCM (telematics transceiver) ground circuit
DCM (telematics transceiver)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

NOTICE:

Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.
Click here
Before measuring the resistance of the CAN bus, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
Click here
After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the engine switch on (IG) and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.
After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.
Click here
Inspect the fuses for circuits related to this system before performing the following procedure.
Before replacing the DCM (telematics transceiver), refer to Registration.
Click here

HINT:

Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

PROCEDURE

1.	CHECK FOR OPEN IN CAN BUS LINES (DCM (TELEMATICS TRANSCEIVER) BRANCH LINE)

(a) Disconnect the cable from the negative (-) battery terminal.

(b) Disconnect the G9 DCM (telematics transceiver) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G9-15 (CANP) - G9-16 (CANN)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

*a	Front view of wire harness connector (to DCM (Telematics Transceiver))

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (DCM (TELEMATICS TRANSCEIVER))

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G9-4 (E) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

*a	Front view of wire harness connector (to DCM (Telematics Transceiver))

(b) Reconnect the cable to the negative (-) battery terminal.

Standard Voltage:

Tester Connection	Condition	Specified Condition
G9-1 (+B) - Body ground	Always	11 to 14 V
G9-7 (IG2) - Body ground	Engine switch on (IG)	11 to 14 V
G9-8 (ACC) - Body ground	Engine switch on (ACC)	11 to 14 V

REPLACE DCM (TELEMATICS TRANSCEIVER)

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

Check Bus 5 Lines for Short Circuit

Diagnosis System

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