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Rear Window Defogger Circuit Check

WARNING: This page is about a different car, the 2005 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FUSES 

    Check if any of the following fuses for IPDM E/R are blown.

    FUSES REFERENCE

    COMPONENT PARTS AMPERE FUSE NO.
    IPDM E/R 15A 46
    15A 47
    NOTE: Refer to "COMPONENT PARTS AND HARNESS CONNECTOR LOCATION ".

    OK or NG

  2. CHECK REAR WINDOW DEFOGGER RELAY OUTPUT SIGNAL 
    1. Turn ignition switch ON.
    2. Check voltage between IPDM E/R connector E124 terminal 60 and ground.
      Fig 1: Checking Voltage Between IPDM E/R Connector E124 Terminal 60 And Ground
      G03600358Courtesy of NISSAN MOTOR CO., U.S.A.

      60 (B) - Ground : Battery voltage 

    OK or NG

  3. CHECK REAR WINDOW DEFOGGER POWER CIRCUIT HARNESS CONTINUITY 
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R and rear window defogger cut-off relay.
    3. Check continuity between IPDM E/R connector E124 terminal 60 and rear window defogger cut-off relay connector M152 terminal 2.

      2 (B/W) - 60 (B/W) : Continuity should exist  .

    4. Check continuity between IPDM E/R connector E124 terminal 60 and rear window defogger cut-off relay connector M152 terminal 3.

      3 (B/W) - 60 (B/W) : Continuity should exist  .

      5. Fig 2: Checking Continuity Between IPDM E/R Connector E124 Terminal 60 And Rear Window Defogger Cut-Off Relay Connector M152 Terminal 2 And 3
      G03600359Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK : GO TO 4.
    • NG : Repair or replace harness.
  4. INSPECTION OF REAR POWER WINDOW DEFOGGER CUT-OFF RELAY 
    1. Turn ignition switch OFF.
    2. Disconnect rear window defogger cut-off relay.
    3. Check continuity between rear window defogger cut-off relay terminals 3 and 5.
      Fig 3: Checking Continuity Between Rear Window Defogger Cut-Off Relay Terminals 3 And 5
      G03600360Courtesy of NISSAN MOTOR CO., U.S.A.
      CONTINUITY BETWEEN REAR WINDOW DEFOGGER CUT-OFF RELAY TERMINALS 3 AND 5 REFERENCE

      Condition Continuity
      12V direct current supply between terminals 1 and 2 Yes
      No current supply No

    OK or NG

    • OK : GO TO 5.
    • NG : Replace rear window defogger cut-out relay.
  5. CHECK REAR WINDOW DEFOGGER CUT-OFF RELAY GROUND CIRCUIT 
    1. Place rear power drop glass in the closed (UP) position.
    2. Check continuity between rear window defogger cut-off relay connector M152 terminal 1 and ground.
      Fig 4: Checking Continuity Between Rear Window Defogger Cut-Off Relay Connector M152 Terminal 1 And Ground
      G03600361Courtesy of NISSAN MOTOR CO., U.S.A.

      1 (W/R) - Ground : Continuity should exist  .

    OK or NG

    • OK : GO TO 7.
    • NG : GO TO 6.
  6. CHECK REAR POWER DROP GLASS MOTOR (DEF CUT-OFF SWITCH) 
    1. Disconnect rear power drop glass motor (def cut-off switch).
    2. Check continuity between rear power drop glass motor (def cut-off switch) terminals 2 and 3.
      Fig 5: Checking Continuity Between Rear Power Drop Glass Motor Terminals 2 And 3
      G03600362Courtesy of NISSAN MOTOR CO., U.S.A.
      CONTINUITY BETWEEN REAR POWER DROP GLASS MOTOR TERMINALS 2 AND 3 REFERENCE

      Terminal Rear power drop glass position Continuity
      2 3 Closed (UP) Yes
      Open (DOWN) more than 18 mm No

    OK or NG

  7. CHECK REAR WINDOW DEFOGGER POWER SUPPLY CIRCUIT 
    1. Disconnect rear window defogger.
    2. Turn ignition switch ON.
    3. Check voltage between rear window defogger connector B77 terminal 1 and ground.
      Fig 6: Checking Voltage Between Rear Window Defogger Connector B77 Terminal 1 And Ground
      G03600363Courtesy of NISSAN MOTOR CO., U.S.A.
      VOLTAGE BETWEEN REAR WINDOW DEFOGGER CONNECTOR B77 TERMINAL 1 AND GROUND REFERENCE

      Connector Terminal (Wire color) Condition Voltage (V) (Approx.)
      (+) (-)
      B77 1 (W/L) Ground Rear window defogger switch ON. Battery voltage
      Rear window defogger switch OFF. 0

    OK or NG

    • OK : GO TO 8.
    • NG : Repair or replace harness.
  8. CHECK REAR WINDOW DEFOGGER GROUND CIRCUIT 
    1. Disconnect rear window defogger ground.
    2. Turn ignition switch OFF.
    3. Check continuity between rear window defogger connector B78 terminal 2 and ground.
      Fig 7: Checking Continuity Between Rear Window Defogger Connector B78 Terminal 2 And Ground
      G03600364Courtesy of NISSAN MOTOR CO., U.S.A.

      2 (B) - Ground : Continuity should exist  .

    OK or NG

    • OK : Check filament. Refer to "FILAMENT CHECK ".
      • If filament is OK.

        Check the condition of the harness and the connector.

      • If filament is NG.

        Repair filament.

    • NG : Repair or replace harness.
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