Toyota Yaris: Power Mirror Control System / Mirror Heater does not Operate with Rear Defogger Switch

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Vehicle Exterior / Mirror (ext) / Power Mirror Control System / Mirror Heater does not Operate with Rear Defogger Switch

DESCRIPTION

When the mirror heater switch (rear window defogger switch) is operated, the RR DEF 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 RR DEF 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 operate the mirror heaters.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • If the auxiliary battery voltage becomes low, auxiliary battery load control will operate in order to ensure sufficient power is supplied to the power steering system. In this case, the window defogger system may not operate.
  • 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

PROCEDURE

1.

CHECK VEHICLE CONDITION

(a) Check vehicle condition.

Result

Proceed to

Both mirror heater does not operate

A

LH side mirror heater does not operate

B

RH side mirror heater does not operate

C

B

GO TO STEP 6

C

GO TO STEP 8

A

2.

CHECK WINDOW DEFOGGER SYSTEM

(a) Check the window defogger system operation.

Click here

OK:

The window defogger system operates normally.

NG

GO TO WINDOW DEFOGGER SYSTEM

OK

3.

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

(a) Disconnect the L14 outer rear view mirror assembly LH connector.

(b) Disconnect the K14 outer rear view mirror assembly RH connector.

(c) Disconnect the 4B power distribution box assembly connector.

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

Standard Resistance:

LH Side

Tester Connection

Condition

Specified Condition

L14-7 (+) - 4B-2

Always

Below 1 Ω

L14-2 (-) - Body Ground

Always

Below 1 Ω

L14-7 (+) or 4B-2 - Body ground

Always

10 kΩ or higher

RH Side

Tester Connection

Condition

Specified Condition

K14-7 (+) - 4B-2

Always

Below 1 Ω

K14-2 (-) - Body Ground

Always

Below 1 Ω

K14-7 (+) or 4B-2 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH

Click here

NG

GO TO STEP 7

OK

5.

INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH

Click here

OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

NG

GO TO STEP 9

6.

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

(a) Disconnect the L14 outer rear view mirror assembly LH connector.

(b) Disconnect the 4B 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

L14-7 (+) - 4B-2

Always

Below 1 Ω

L14-2 (-) - Body Ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

INSPECT OUTER MIRROR LH

Click here

OK

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH

NG

REPLACE OUTER MIRROR LH

8.

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

(a) Disconnect the K14 outer rear view mirror assembly RH connector.

(b) Disconnect the 4B 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

K14-7 (+) - 4B-2

Always

Below 1 Ω

K14-2 (-) - Body Ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.

INSPECT OUTER MIRROR RH

Click here

OK

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH

NG

REPLACE OUTER MIRROR RH

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