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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 901 (Defogger) >> DTC/Circuit Diagnosis >> Rear Window Defogger Switch >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

  1. CHECK A/C AND AV SWITCH ASSEMBLY (REAR WINDOW DEFOGGER SWITCH) CIRCUIT 

    Check rear window defogger switch operation.

    Is the inspection result normal? 

    YES: Inspection End.

    NO: GO TO 2

  2. CHECK HARNESS CONTINUITY 
    1. Turn ignition switch OFF.
    2. Disconnect BCM and A/C and AV switch assembly.
    3. Check continuity between BCM connector M19 terminal 41 and A/C and AV switch assembly connector M98 terminal 16.
      BCM connector Terminal A/C and AV switch assembly connector Terminal Continuity
      M19 41 M98 16 Yes
    4. Check continuity between BCM connector M19 terminal 41 and ground.
      BCM connector Terminal Ground Continuity
      M19 41 No

      Is the inspection result normal? 

      YES: Replace A/C and AV switch assembly. Refer to "REMOVAL AND INSTALLATION ".

      NO: Repair or replace harness.

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