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Home › Lexus › 2008 › LS 600hL › 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 DTC 
    1. Use the intelligent tester or Techstream to check if the CAN communication system is functioning normally.

    Result 

    RESULT CHART

    Result Proceed to
    CAN DTC is not output A
    CAN DTC is output B

    B: GO TO CAN COMMUNICATION SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

    A: Go to next Step 

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

      OK: Defogger operates normally. 

      NG: GO TO WINDOW DEFOGGER SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

      OK: Go to next Step 

  3. PERFORM ACTIVE TEST USING INTELLIGENT TESTER OR TECHSTREAM (MIRROR HEATER FUNCTION) 
    1. Select the ACTIVE TEST, use the intelligent tester or Techstream to generate a control command, and then check the mirror heater function.
      1. Intelligent tester

        D-DOOR 

        TESTER DISPLAY CHART

        Tester Display Test Part Control Range Diagnostic Note
        MIRR HEATER Mirror heater operation OFF/ON -

        P-DOOR 

        TESTER DISPLAY CHART

        Tester Display Test Part Control Range Diagnostic Note
        MIRR HEATER Mirror heater operation OFF/ON -
      2. Techstream

        Driver Door 

        TESTER DISPLAY CHART

        Tester Display Test Part Control Range Diagnostic Note
        Mirror Heater Mirror heater operation OFF / ON -

        Passenger Door 

        TESTER DISPLAY CHART

        Tester Display Test Part Control Range Diagnostic Note
        Mirror Heater Mirror heater operation OFF / ON -

        Result (Driver Side) 

        RESULT CHART

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

        Result (Passenger Side) 

        RESULT CHART

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

        B: REPLACE AIR CONDITIONING AMPLIFIER  (See REMOVAL )

        C:  Go to step  5

        D: REPLACE AIR CONDITIONING AMPLIFIER  (See REMOVAL )

        A: Go to next Step 

  4. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH 
    1. Remove the mirror LH (see REMOVAL )
    2. Check the operation of the mirror heater.
      1. Measure the resistance according to the value (s) in the table below.

        Standard resistance 

        TESTER CONNECTION SPECIFIED CONDITION CHART

        Tester Connection Condition Specified Condition
        4 (HTR+) - 12 (HTR-) 25°C (75°F) 3.6 to 4 8 Ω
      2. Apply battery voltage and check the mirror heater operation

        OK 

        MEASUREMENT SPECIFIED CONDITION CHART

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

        HINT

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

        NG: REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH  (See REMOVAL )

        Fig 1: Identifying Outer Rear View Mirror Assembly LH Connector Terminal
        G05784635Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        OK: REPLACE FRONT DOOR ECU LH  (See ON-VEHICLE INSPECTION )

  5. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH 
    1. Remove the mirror RH (see REMOVAL ).
    2. Check the operation of the mirror heater.
      1. Measure the resistance according to the value (s) in the table below.

        Standard resistance 

        TESTER CONNECTION SPECIFIED CONDITION CHART

        Tester Connection Condition Specified Condition
        4 (HTR+) - 12 (HTR-) 25°C (75°F) 3.6 to 4.8 Ω
      2. Apply battery voltage and check the mirror heater operation

        OK 

        MEASUREMENT SPECIFIED CONDITION CHART

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

        HINT

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

        NG: REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH  (See REMOVAL )

        Fig 2: Identifying Outer Rear View Mirror Assembly RH Connector Terminal
        G05784636Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        OK: REPLACE FRONT DOOR ECU RH  (See ON-VEHICLE INSPECTION )

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