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

DESCRIPTION

When the mirror heater switch (rear window defogger switch) on the air conditioning control assembly is pressed, the operation signal is sent 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

A003LQAE02

CAUTION / NOTICE / HINT

Note


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

  • If the auxiliary battery voltage is low, the mirror heater function may not operate. In this case, check the Data List item "Battery Control Count (Body ECU)".

    Click here

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    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 or 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 (DEF RELAY - OUTER REAR VIEW MIRROR ASSEMBLY RH - BODY GROUND) Click here

    C

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


    1. Remove the DEF relay from the NO. 2 relay block assembly.

    2. Disconnect the J8 outer rear view mirror assembly RH connector.

    3. Disconnect the K8 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
      DEF relay holder terminal-3 - J8-2 (+) Always Below 1 Ω
      DEF relay holder terminal-3 - K8-2 (+) Always Below 1 Ω
      DEF relay holder terminal-3 - Body Ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Remove the DEF relay from the NO. 2 relay block assembly.

    2. Disconnect the J8 outer rear view mirror assembly RH connector.

    3. Disconnect the K8 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
      DEF relay holder terminal-3 - J8-2 (+) Always Below 1 Ω
      J8-8 (-) - Body Ground Always Below 1 Ω
      J8-2 (+) - Body Ground Always 10 kΩ or higher
      DEF relay holder terminal-3 - 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


    1. Remove the outer mirror RH.

      Click here

    2. Inspect the outer mirror RH.

      Click here

      OK
      Outer rear 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 (DEF RELAY - OUTER REAR VIEW MIRROR ASSEMBLY LH - BODY GROUND)


    1. Remove the DEF relay from the NO. 2 relay block assembly.

    2. Disconnect the K8 outer rear view mirror assembly LH connector.

    3. Disconnect the J8 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
      DEF relay holder terminal-3 - K8-2 (+) Always Below 1 Ω
      K8-8 (-) - Body Ground Always Below 1 Ω
      K8-2 (+) - Body Ground Always 10 kΩ or higher
      DEF relay holder terminal-3 - 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


    1. Remove the outer mirror LH.

      Click here

    2. Inspect the outer mirror LH.

      Click here

      OK
      Outer rear 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