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Home › Nissan-Datsun › 2004 › Sentra SE-R › Repair and Diagnosis › External Pages › Different car › Section 1682 (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 2006 Nissan Pathfinder. 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: CONSULT-II Display - Data Monitor
    G04176093Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. Turn ignition switch ON.
    2. Check voltage between BCM connector and ground.
    TERMINAL VOLTAGE SPECIFICATION

    Connector Terminals Condition Voltage (V) (Approx.)
    (+) (-)
    M18 9 Ground Rear window defogger switch is pressed. 0
    Rear window defogger switch is OFF. 5

    OK or NG 

    OK: Rear window defogger switch check is OK.

    NG: GO TO 2.

    Fig 2: Checking Voltage Between BCM Connector And Ground
    G04176094Courtesy of NISSAN MOTOR CO., U.S.A.
  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
    G04176095Courtesy 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: Replace front air control. Refer to "AIR CONDITIONER CONTROL "

    NG: Replace BCM. Refer to "REMOVAL AND INSTALLATION "

    Fig 4: Checking Voltage Between BCM Connector M18 Terminal 9 And Ground
    G04176096Courtesy of NISSAN MOTOR CO., U.S.A.
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