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Home › Nissan-Datsun › 2003 › Sentra SE-R, Automatic › Repair and Diagnosis › External Pages › Different car › Section 1631 (Glass, Window System & Mirrors) › Rear Window Defogger › Rear Window Defogger Switch Circuit Check

Rear Window Defogger Switch Circuit Check

WARNING: This page is about a different car, the 2005 Nissan Frontier. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK REAR WINDOW DEFOGGER SWITCH OPERATION 

    With CONSULT-II 

    Check ("REAR DEF SW", "IGN ON SW") in DATA MONITOR mode with CONSULT-II.

    When rear window defogger switch is turned to ON 

    REAR DEF SW : ON 

    When ignition switch is turned to ON 

    IGN ON SW : ON 

    Fig 1: Display DATA MONITOR Mode
    G03596768Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. Turn ignition switch ON.
    2. Check voltage between BCM connector and ground.
      BCM CONNECTOR AND GROUND VOLTAGE SPECIFICATIONS

      Connector Terminals Condition Voltage (V) (Approx.)
      (+) (-)
      M18 9 Ground Rear window defogger switch ON. 0
      Rear window defogger switch OFF. 5
      Fig 2: Checking Voltage Between BCM Connector And Ground
      G03596769Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK : Rear window defogger switch check is OK.
    • NG : GO TO 2.
  2. CHECK REAR WINDOW DEFOGGER SWITCH CIRCUIT HARNESS CONTINUITY 
    1. Turn ignition switch OFF.
    2. Disconnect BCM and front air control.
    3. Check continuity between BCM connector M18 terminal 9 and front air control connector M49 terminal 11.

      9 - 11 : Continuity should exist. 

    4. Check continuity between BCM connector M18 terminal 9 and ground

      9 - Ground : Continuity should not exist. 

    OK or NG 

    • OK : GO TO 3.
    • NG : Repair or replace harness.
      Fig 3: Checking Continuity Between BCM Connector M18 Terminal 9 And Front Air Control Connector M49 Terminal 11
      G03596770Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK BCM OUTPUT SIGNAL 
    1. Connect BCM.
    2. Turn ignition switch ON.
    3. Check voltage between BCM connector M18 terminal 9 and ground.

      9 - Ground : Approx. 5V 

    OK or NG 

    • OK : GO TO 4.
    • NG : Replace BCM. Refer to "REMOVAL AND INSTALLATION OF BCM ".
      Fig 4: Checking Voltage Between BCM Connector M18 Terminal 9 And Ground
      G03596771Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK POWER SUPPLY CIRCUITS FOR FRONT AIR CONTROL 
    1. Turn ignition switch OFF.
    2. Disconnect front air control.
    3. Check voltage between front air control connector M49 terminals 6, 19 and ground.
      FRONT AIR CONTROL CONNECTOR TERMINALS AND GROUND VOLTAGE SPECIFICATIONS

      Connector Terminals Ignition switch position
      (+) (-) OFF ACC ON
      M49 6 Ground Approx. 0V Approx. 0V Battery voltage
      M49 19 Battery voltage Battery voltage Battery voltage
      Fig 5: Checking Voltage Between Front Air Control Connector M49 Terminals 6, 19 And Ground
      G03596772Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK : GO TO 5.
    • NG : Check 10A fuses [No. 8 and 19, located in the fuse block (J/B)]. Refer to "FUSE BLOCK-JUNCTION BOX(J/B) ".
      • If fuses are OK, check harness for open circuit. Repair or replace as necessary.
      • If fuses are NG, replace fuse and check harness for short circuit. Repair or replace as necessary.
  5. CHECK GROUND CIRCUIT FOR FRONT AIR CONTROL 

    Check continuity between front air control harness connector M49 terminal 20 and ground.

    20 - Ground : Continuity should exist. 

    OK or NG 

    • OK : Replace front air control. Refer to "CONTROL UNIT ".
    • NG : Repair harness or connector.
      Fig 6: Checking Continuity Between Front Air Control Harness Connector M49 Terminal 20 And Ground
      G03596773Courtesy of NISSAN MOTOR CO., U.S.A.
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