POWER MIRROR CONTROL SYSTEM Mirror Heater does not Operate with Rear Defogger Switch

DTC Code DTC Name
Mirror Heater does not Operate with Rear Defogger Switch

DESCRIPTION

When the mirror heater switch (rear window defogger switch) on the heater control panel assembly is pressed, the operation signal is sent to the defogger relay via a direct line. When the defogger relay receives the signal, it turns on the defogger relay to operate the mirror heaters.

WIRING DIAGRAM

B372373E03

CAUTION / NOTICE / HINT

Note:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

  1. CHECK MIRROR HEATER FUNCTION

    1. Check the mirror heater operation.

      Click here

      OK

      The mirror heater operates normally.

    Result

    Result

    Proceed to

    Mirror heater operation on both mirrors is not normal

    A

    Mirror heater operation on RH side mirror is not normal

    B

    Mirror heater operation on LH side mirror is not normal

    C
    B

    CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY - OUTER REAR VIEW MIRROR ASSEMBLY RH - BODY GROUND)Click here

    C

    CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY - OUTER REAR VIEW MIRROR ASSEMBLY LH - BODY GROUND)Click here

    A

  2. CHECK WINDOW DEFOGGER SYSTEM

    1. Check the window defogger system operation.

      Click here

      OK

      The window defogger system operates normally.

    Result

    Proceed to

    OK

    NG
    NG

    GO TO WINDOW DEFOGGER SYSTEM

    Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY - OUTER REAR VIEW MIRROR ASSEMBLY LH/RH)

    1. B372374C01

      *1

      Center Relay Block

      Remove the DEFOGGER relay from center relay block.

    2. Disconnect the G4 outer rear view mirror assembly RH connector.

    3. Disconnect the H4 outer rear view mirror assembly LH connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Center relay block DEFOGGER relay terminal 3 - G4-2 (+)

      Always

      Below 1 Ω

      Center relay block DEFOGGER relay terminal 3 - H4-2 (+)

      Always

      Below 1 Ω

      Center relay block DEFOGGER relay terminal 3 or G4-2 (+) - Body Ground

      Always

      10 kΩ or higher

      Center relay block DEFOGGER relay terminal 3 or H4-2 (+) - Body Ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY - OUTER REAR VIEW MIRROR ASSEMBLY RH - BODY GROUND)

    1. B372374C01

      *1

      Center Relay Block

      Remove the DEFOGGER relay from center relay block.

    2. Disconnect the G4 outer rear view mirror assembly RH connector.

    3. Disconnect the H4 outer rear view mirror assembly LH connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Center relay block DEFOGGER relay terminal 3 - G4-2 (+)

      Always

      Below 1 Ω

      G4-1 (-) - Body Ground

      Always

      Below 1 Ω

      Center relay block DEFOGGER relay terminal 3 or G4-2 (+) - Body Ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT OUTER MIRROR RH (MIRROR HEATER)

    1. Remove the outer mirror RH.

      Click here

    2. Inspect the outer mirror RH.

      Click here

      OK

      Outer mirror RH is normal.

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH

    Click here

    NG

    REPLACE OUTER MIRROR RH

    Click here

  6. CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY - OUTER REAR VIEW MIRROR ASSEMBLY LH - BODY GROUND)

    1. B372374C01

      *1

      Center Relay Block

      Remove the DEFOGGER relay from the center relay block.

    2. Disconnect the G4 outer rear view mirror assembly RH connector.

    3. Disconnect the H4 outer rear view mirror assembly LH connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Center relay block DEFOGGER relay terminal 3 - H4-2 (+)

      Always

      Below 1 Ω

      H4-1 (-) - Body Ground

      Always

      Below 1 Ω

      Center relay block DEFOGGER relay terminal 3 or H4-2 (+) - Body Ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT OUTER MIRROR LH (MIRROR HEATER)

    1. Remove the outer mirror LH.

      Click here

    2. Inspect the outer mirror LH.

      Click here

      OK

      Outer mirror LH is normal.

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH

    Click here

    NG

    REPLACE OUTER MIRROR LH

    Click here