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Home >> Lexus >> 2007 >> GS 430 >> Repair and Diagnosis >> Body & Frame >> Mirrors >> Mirror >> Power Mirror Control System >> Mirror Heater does not Operate with Rear Defogger Switch >> Inspection Procedure

Inspection Procedure

  1. CHECK DEFOGGER SYSTEM 
    1. Check that the defogger operates normally.

      OK: 

      Defogger operates normally. 

    NG:  GO TO DEFOGGER SYSTEM

    OK: Go to next step 

  2. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (MIRROR HEATER FUNCTION) 
    1. Select the ACTIVE TEST, use the intelligent tester to generate a control command, and then check the mirror heater function. Front multiplex network door ECU LH, RH
    DIAGNOSIS NOTE CHART

    Item Test Details Diagnostic Note
    MIRR HEATER Mirror heater operation OFF / ON -

    Result: 

    Front multiplex network door ECU LH: 

    RESULT CHART

    Result Proceed to
    Outer rear view mirror LH does not operate normally A
    Outer rear view mirror LH operates normally B

    Result: 

    Front multiplex network door ECU RH: 

    RESULT CHART

    Result Proceed to
    Outer rear view mirror RH does not operate normally C
    Outer rear view mirror RH operates normally D

    B:  Go to step  5

    C:  Go to step  4

    D:  Go to step  6

    A: Go to next step 

  3. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH (MIRROR HEATER) 
    1. Remove the mirror LH.
    2. Check the operation of the mirror heater.
      1. Measure the resistance between terminals 4 and 12 of the connector.

        Standard resistance: 

        3.6 to 4.8 Ω at 25°C (75°F) 

      2. Apply battery voltage and check the mirror heater operation.

        OK 

        MEASUREMENT CONDITION CHART

        Measurement Condition Specified Condition
        Battery positive (+) → Terminal 4 (+)
        Battery negative (-) → Terminal 12 (-)        		 Mirror becomes warm

        HINT:

        It will take a short time for the mirror to become warm.

    Fig 1: Inspecting Outer Rear View Mirror Assembly LH (Mirror Heater)
    G05300293Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH 

    OK: REPLACE FRONT MULTIPLEX NETWORK DOOR ECU LH 

  4. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH (MIRROR HEATER) 
    1. Remove the mirror RH.
    2. Check the operation of the mirror heater.
      1. Measure the resistance between terminals 4 and 12 of the connector.

        Standard resistance: 

        3.6 to 4.8 Ω at 25°C (75°F) 

      2. Apply battery voltage and check the mirror heater operation.

        OK 

        MEASUREMENT CONDITION CHART

        Measurement Condition Specified Condition
        Battery positive (+) → Terminal 4 (+)
        Battery negative (-) → Terminal 12 (-)        		 Mirror becomes warm

        HINT:

        It will take a short time for the mirror to become warm.

    Fig 2: Inspecting Outer Rear View Mirror Assembly RH (Mirror Heater)
    G05300294Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH 

    OK: REPLACE FRONT MULTIPLEX NETWORK DOOR ECU RH 

  5. CHECK FRONT MULTIPLEX NETWORK DOOR ECU LH 
    1. Check if the malfunction disappears when a normally functioning front multiplex network door ECU LH is installed.

      OK: 

      Mirror heater operates normally. 

    NG: REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

    OK: REPLACE FRONT MULTIPLEX NETWORK DOOR ECU LH 

  6. CHECK FRONT MULTIPLEX NETWORK DOOR ECU RH 
    1. Check if the malfunction disappears when a normally functioning front multiplex network door ECU RH is installed.

      OK: 

      Mirror heater operates normally. 

    NG: REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

    OK: REPLACE FRONT MULTIPLEX NETWORK DOOR ECU RH 

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