Toyota Avalon (XX50): Driver Seat Control ECU Communication Stop Mode. Driving Support ECU Communication Stop Mode. Dtc Check / Clear

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Power Source, Network / Networking / Can Communication System(for Gasoline Model) / Driver Seat Control ECU Communication Stop Mode. Driving Support ECU Communication Stop Mode. Dtc Check / Clear

Driver Seat Control ECU Communication Stop Mode

DESCRIPTION

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

Detection Item

Symptom

Trouble Area

Driver Seat Control ECU Communication Stop Mode

Any of the following conditions are met:

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

Position control ECU assembly LH branch line or connector
Power source circuit of position control ECU assembly LH
Position control ECU assembly LH ground circuit
Position control ECU assembly LH

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 (POSITION CONTROL ECU ASSEMBLY LH BRANCH LINE)

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

(b) Disconnect the R32 position control ECU assembly LH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
R32-13 (CANP) - R32-14 (CANN)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

*a	Front view of wire harness connector (to Position Control ECU Assembly LH)

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (POSITION CONTROL ECU ASSEMBLY LH)

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the R33 position control ECU assembly LH connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R33-2 (E) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

*a	Front view of wire harness connector (to Position Control ECU Assembly LH)

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
R33-3 (B) - Body ground	Always	11 to 14 V
R32-1 (IG) - Body ground	Engine switch on (IG)	11 to 14 V
R32-15 (SYSB) - Body ground	Always	11 to 14 V

REPLACE POSITION CONTROL ECU ASSEMBLY LH

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

Driving Support ECU Communication Stop Mode

DESCRIPTION

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

Detection Item

Symptom

Trouble Area

Driving Support ECU Communication Stop Mode

Any of the following conditions are met:

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

Driving support ECU assembly branch line or connector
Power source circuit of driving support ECU assembly
Driving support ECU assembly ground circuit
Driving support ECU assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

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

NOTICE:

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
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
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 (DRIVING SUPPORT ECU ASSEMBLY BRANCH LINE)

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

(b) Disconnect the G39 driving support ECU assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G39-10 (CA2H) - G39-11 (CA2L)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

*a	Front view of wire harness connector (to Driving Support ECU Assembly)

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (DRIVING SUPPORT 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
G39-28 (GND) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

*a	Front view of wire harness connector (to Driving Support ECU Assembly)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
G39-7 (B) - Body ground	Engine switch on (IG)	11 to 14 V

REPLACE DRIVING SUPPORT ECU ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

Dtc Check / Clear

DTC CHECK / CLEAR

CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

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

(d) Enter the following menus: Body Electrical / Central Gateway / Trouble Codes.

Body Electrical > Central Gateway > Trouble Codes

(e) Read the DTCs.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

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

(d) Enter the following menus: Body Electrical / Central Gateway / Trouble Codes.

Body Electrical > Central Gateway > Trouble Codes

(e) Clear the DTCs.

Body Electrical > Central Gateway > Clear DTCs

Diagnostic Trouble Code Chart. Door Mirror ECU LH Communication Stop Mode. Door Mirror ECU RH Communication Stop Mode

Dtc Combination Table

See More:

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