| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM1000000028DZB |
| Model Year Start: 2023 | Model: GR Corolla | Prod Date Range: [11/2022 - ] |
| Title: MIRROR (EXT): POWER MIRROR CONTROL SYSTEM: Mirror Heater does not Operate with Rear Defogger Switch; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [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 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 - ]; MIRROR (EXT): POWER MIRROR CONTROL SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING](/t3Portal/stylegraphics/info.gif)
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 |
|
| C |
|
|
|
2. |
CHECK WINDOW DEFOGGER SYSTEM |
(a) Check the window defogger system operation.
Click here
OK:
The window defogger system operates normally.
| NG |
|
|
|
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 |
|
|
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 |
|
|
5. |
INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH |
Click here
| NG |
|
|
|
6. |
INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH |
Click here
| OK |
|
| NG |
|
|
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 |
|
|
8. |
INSPECT OUTER MIRROR LH |
Click here
| OK |
|
| NG |
|
|
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 |
|
|
10. |
INSPECT OUTER MIRROR RH |
Click here
| OK |
|
| NG |
|
|
|