Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM10000000269ON
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 - 11/2022]
Title: MIRROR (EXT): POWER MIRROR CONTROL SYSTEM (for TMC Made): Mirror Heater does not Operate with Rear Defogger Switch; 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]

Mirror Heater does not Operate with Rear Defogger Switch

DESCRIPTION

  • When the mirror heater switch (rear window defogger switch) is operated, the MIR HTR relay drive request signal is sent to the air conditioning amplifier assembly and then to main body ECU (multiplex network body ECU) via CAN communication. When the main body ECU (multiplex network body ECU) receives the MIR HTR relay drive request signal, it sends a mirror heater operation signal to the power distribution box assembly.

    Based on this signal, the power distribution box assembly operates the mirror heaters.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • The power mirror control system uses the CAN communication system, LIN communication system and CXPI communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the power mirror control system after confirming that the communication system is functioning properly.

    Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; MIRROR (EXT): POWER MIRROR CONTROL SYSTEM (for TMC Made): HOW TO PROCEED WITH TROUBLESHOOTING

PROCEDURE

1.

CHECK VEHICLE CONDITION

(a) Check vehicle condition.

Result

Proceed to

Both mirror heaters do not operate

A

LH side mirror heater does not operate

B

RH side mirror heater does not operate

C

B

GO TO STEP 7

C

GO TO STEP 9

A

2.

CHECK WINDOW DEFOGGER SYSTEM

(a) Check the window defogger system operation.

Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; WINDOW / GLASS: WINDSHIELD DEICER SYSTEM (for TMC Made): OPERATION CHECK

OK:

The window defogger system operates normally.

NG

GO TO WINDOW DEFOGGER SYSTEM

OK

3.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - POWER SOURCE)

(a) Disconnect the 8M power distribution box assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

8M-1 - Body Ground

Ignition switch off

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (OUTER REAR VIEW MIRROR ASSEMBLY LH/RH - POWER DISTRIBUTION BOX ASSEMBLY AND BODY GROUND)

(a) Disconnect the K10 outer rear view mirror assembly RH connector.

(b) Disconnect the L9 outer rear view mirror assembly LH connector.

(c) Disconnect the 8A power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K10-2 (+) - 8A-6

Always

Below 1 Ω

K10-4 (E) - Body ground

Always

Below 1 Ω

L9-2 (+) - 8A-6

Always

Below 1 Ω

L9-4 (E) - Body ground

Always

Below 1 Ω

K10-2 (+), L9-2 (+) or 8A-6 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; MIRROR (EXT): OUTER REAR VIEW MIRROR: INSPECTION

NG

GO TO STEP 8

OK

6.

INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; MIRROR (EXT): OUTER REAR VIEW MIRROR: INSPECTION

OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

NG

GO TO STEP 10

7.

CHECK HARNESS AND CONNECTOR (OUTER REAR VIEW MIRROR ASSEMBLY LH - POWER DISTRIBUTION BOX ASSEMBLY AND BODY GROUND)

(a) Disconnect the L9 outer rear view mirror assembly LH connector.

(b) Disconnect the 8A power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

L9-2 (+) - 8A-6

Always

Below 1 Ω

L9-4 (E) - Body Ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

INSPECT OUTER MIRROR LH

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; MIRROR (EXT): OUTER REAR VIEW MIRROR GLASS: INSPECTION

OK

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH

NG

REPLACE OUTER MIRROR LH

9.

CHECK HARNESS AND CONNECTOR (OUTER REAR VIEW MIRROR ASSEMBLY RH - POWER DISTRIBUTION BOX ASSEMBLY AND BODY GROUND)

(a) Disconnect the K10 outer rear view mirror assembly RH connector.

(b) Disconnect the 8A power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K10-2 (+) - 8A-6

Always

Below 1 Ω

K10-4 (E) - Body Ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

10.

INSPECT OUTER MIRROR RH

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; MIRROR (EXT): OUTER REAR VIEW MIRROR GLASS: INSPECTION

OK

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH

NG

REPLACE OUTER MIRROR RH