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 rear window defogger switch on the air conditioning control assembly is pressed, the operation signal is transmitted to the air conditioning amplifier assembly via LIN communication. When the air conditioning amplifier assembly receives the signal, it turns on the defogger relay to operate the mirror heaters.

WIRING DIAGRAM

B327536E02

CAUTION / NOTICE / HINT

Note:

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

  • If the battery voltage becomes low, mirror heater operation is canceled to prioritize supplying power to the power steering system.

PROCEDURE

  1. PERFORM ACTIVE TEST USING GTS

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

    5. Perform the Active Test according to the display on the GTS.

      Body Electrical > Air Conditioner > Active Test

      Tester Display

      Measurement Item

      Control Range

      Diagnostic Note

      Defogger Relay (Rear)

      Mirror Heater

      OFF/ON

      -

      Body Electrical > Air Conditioner > Active Test

      Tester Display

      Defogger Relay (Rear)

      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 hereClick here

      OK

      The window defogger system operates normally.

    Result

    Proceed to

    OK

    NG
    OK

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

    NG

    GO TO WINDOW DEFOGGER SYSTEM

    Click hereClick here

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

    1. Remove the DEFOGGER relay from the engine room relay block and junction block assembly.

    2. Disconnect the G8 outer rear view mirror assembly RH connector.

    3. Disconnect the H8 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

      DEFOGGER relay holder terminal-3 - H8-8 (+)

      Always

      Below 1 Ω

      H8-9 (-) - Body Ground

      Always

      Below 1 Ω

      H8-8 (+) - Body Ground

      Always

      10 kΩ or higher

      DEFOGGER relay holder terminal-3 - Body Ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT OUTER MIRROR RH

    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 hereClick here

    NG

    REPLACE OUTER MIRROR RH

    Click here

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

    1. Remove the DEFOGGER relay from the engine room relay block and junction block assembly.

    2. Disconnect the H8 outer rear view mirror assembly LH connector.

    3. Disconnect the G8 outer rear view mirror assembly RH connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      DEFOGGER relay holder terminal-3 - G8-8 (+)

      Always

      Below 1 Ω

      G8-9 (-) - Body Ground

      Always

      Below 1 Ω

      G8-8 (+) - Body Ground

      Always

      10 kΩ or higher

      DEFOGGER relay holder terminal-3 - Body Ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT OUTER MIRROR LH

    1. Remove the outer mirror LH.

      Click here

    2. Inspect the outer mirror LH.

      Click here

      OK

      Outer rear view mirror RH is normal.

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH

    Click hereClick here

    NG

    REPLACE OUTER MIRROR LH

    Click here