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Home >> Infiniti >> 2012 >> M37 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 111 (Defogger) >> DTC/Circuit Diagnosis >> Rear Window Defogger >> Diagnosis Procedure
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Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Infiniti M56 and 2013 Infiniti M37. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FUSE 
    1. Turn ignition switch OFF.
    2. Check the following items.
      • 20A fuse [No. 14, located in fuse block (J/B)]
      • 20A fuse [No. 15, located in fuse block (J/B)]

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Replace the blown fuse after repairing the affected circuit if a fuse is blown.

  2. CHECK POWER SUPPLY CIRCUIT 
    1. Turn ignition switch ON.
    2. Check voltage between rear window defogger harness connector and ground.
      (+) (-) Condition Voltage (V) (Approx.)
      Rear window defogger
      Connector Terminal
      B471 1 Ground Rear window defogger switch ON Battery voltage
      OFF 0

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: GO TO  4.

  3. CHECK GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect rear window defogger connector.
    3. Check continuity between rear window defogger harness connector and ground.
      Rear window defogger Ground Continuity
      Connector Terminal
      B472 2 Existed

      Is the inspection result normal? 

      YES: GO TO  7.

      NO: Repair or replace harness.

  4. CHECK REAR WINDOW DEFOGGER CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect condenser connector and fuse block (J/B) connector.
    3. Check continuity between fuse block (J/B) harness connector and condenser harness connector.
      Fuse block (J/B) Condenser Continuity
      Connector Terminal Connector Terminal
      B6 10G B22 1 Existed
      11G

      Is the inspection result normal? 

      YES: GO TO 5.

      NO: Repair or replace harness.

  5. CHECK FUSE BLOCK (J/B) 
    1. Turn ignition switch ON.
    2. Check voltage between fuse block (J/B) (fuse block side) and ground.
      (+) (-) Condition Voltage (V) (Approx.)
      Fuse block (J/B)
      Connector Terminal
      B6 10G Ground Rear window defogger switch: ON Battery voltage
      Rear window defogger switch: OFF 0
      11G Rear window defogger switch: ON Battery voltage
      Rear window defogger switch: OFF 0

      Is the inspection result normal? 

      YES: GO TO 6.

      NO: Replace fuse block (J/B).

  6. CHECK CONDENSER 

    Check condenser. Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO  8.

    NO: Replace condenser.

  7. CHECK FILAMENT 

    Check the filament for damage or blown.

    Refer to "INSPECTION AND REPAIR ".

    Is the inspection result normal? 

    YES: GO TO 8.

    NO: Repair filament.

  8. CHECK INTERMITTENT INCIDENT 

    Check intermittent incident.

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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