Toyota Avalon (XX50): Door Mirror ECU LH Communication Stop Mode. Door Mirror ECU RH Communication Stop Mode. Driver Seat Control ECU Communication Stop Mode

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Power Source, Network / Networking / Can Communication System(for Hv Model) / Door Mirror ECU LH Communication Stop Mode. Door Mirror ECU RH Communication Stop Mode. Driver Seat Control ECU Communication Stop Mode

Door Mirror ECU LH Communication Stop Mode

DESCRIPTION

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

Detection Item

Symptom

Trouble Area

Door Mirror ECU LH Communication Stop Mode

Any of the following conditions are met:

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

Outer mirror control ECU assembly LH branch line or connector
Power source circuit of outer mirror control ECU assembly LH
Outer mirror control ECU assembly LH ground circuit
Outer mirror 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 power 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 (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary 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 power 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 (OUTER MIRROR CONTROL ECU ASSEMBLY LH BRANCH LINE)

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

(b) Disconnect the I21 outer mirror control ECU assembly LH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
I21-9 (CANP) - I21-8 (CANN)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

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

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

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
I21-7 (GND) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

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

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
I21-5 (SIG) - Body ground	Power switch on (IG)	11 to 14 V
I21-6 (CPUB) - Body ground	Power switch off	11 to 14 V
I21-14 (BDR) - Body ground	Power switch off	11 to 14 V

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

Door Mirror ECU RH Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
Door Mirror ECU RH Communication Stop Mode	Any of the following conditions are met: Communication stop for "Front Door RH/R-Mirror (FR-Door/R-Mirror)" is indicated on the "Communication Bus Check" screen of the Techstream. Click here Communication stop history for "Front Door RH/R-Mirror (FR-Door/R-Mirror)" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "Front Door RH/R-Mirror (FR-Door/R-Mirror)" is 6 or more.) Click here Communication system DTCs (DTCs that start with U) that correspond to "Door Mirror ECU RH Communication Stop Mode" in "DTC Combination Table" are output. Click here	Outer mirror control ECU assembly RH branch line or connector Power source circuit of outer mirror control ECU assembly RH Outer mirror control ECU assembly RH ground circuit Outer mirror control ECU assembly RH

Detection Item

Symptom

Trouble Area

Door Mirror ECU RH Communication Stop Mode

Any of the following conditions are met:

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

Outer mirror control ECU assembly RH branch line or connector
Power source circuit of outer mirror control ECU assembly RH
Outer mirror control ECU assembly RH ground circuit
Outer mirror control ECU assembly RH

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 power 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 (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary 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 power 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 (OUTER MIRROR CONTROL ECU ASSEMBLY RH BRANCH LINE)

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

(b) Disconnect the I5 outer mirror control ECU assembly RH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
I5-9 (CANP) - I5-8 (CANN)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

*a	Front view of wire harness connector (to Outer Mirror Control ECU assembly RH)

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY RH)

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
I5-7 (GND) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

*a	Front view of wire harness connector (to Outer Mirror Control ECU assembly RH)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
I5-5 (SIG) - Body ground	Power switch on (IG)	11 to 14 V
I5-6 (CPUB) - Body ground	Power switch off	11 to 14 V
I5-14 (BDR) - Body ground	Power switch off	11 to 14 V

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY RH

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

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 power 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 (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary 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 power 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 (-) auxiliary 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 (-) auxiliary 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 (-) auxiliary 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	Power switch off	11 to 14 V
R32-1 (IG) - Body ground	Power switch on (IG)	11 to 14 V
R32-15 (SYSB) - Body ground	Power switch off	11 to 14 V

REPLACE POSITION CONTROL ECU ASSEMBLY LH

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

DCM Communication Stop Mode. Diagnosis System. Diagnostic Trouble Code Chart

Driving Support ECU Communication Stop Mode. Dtc Check / Clear. ECM Communication Stop Mode

See More:

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Park Assist / Monitoring: Ultrasonic Sensor(for Front)
Components COMPONENTS ILLUSTRATION *1 FRONT CENTER ULTRASONIC SENSOR *2 FRONT CORNER ULTRASONIC SENSOR Inspection INSPECTION PROCEDURE 1. INSPECT FRONT CENTER ULTRASONIC SENSOR (a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition S ...