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Home >> Infiniti >> 2008 >> FX45 >> Repair and Diagnosis >> Electrical >> Motors, Switches, Relays >> Wiper, Washer & Horn >> Front Wiper And Washer System >> Preliminary Check >> Check Power Supply And Ground Circuit

Check Power Supply And Ground Circuit

  1. CHECK FUSE 

    Check for blown fuses.

    FUSE OPERATION FUNCTION

    Unit Power source Fuse and fusible link No.
    Front and Rear washer pump Ignition switch ON or START 84
    Front wiper motor, front wiper relay, front wiper HI relay Battery 73
    BCM Battery M
    22
    Ignition switch ON or START 1

    Refer to "WIRING DIAGRAM - WIPER - ".

    OK or NG 

    OK: GO TO 2

    NG: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse, Refer to "POWER SUPPLY ROUTING CIRCUIT ".

  2. CHECK POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect BCM connector.
    3. Check voltage between BCM harness connector and ground.
      4. Fig 1: Identifying Voltage Between BCM Harness Connector And Ground
      G05222517Courtesy of NISSAN MOTOR CO., U.S.A.
    POWER SUPPLY CIRCUIT

    (+) (-) Ignition switch position
    BCM connector Terminal OFF ON
    M3 38 Ground Approx. 0 V Battery voltage
    M4 42 Battery voltage Battery voltage
    55 Battery voltage Battery voltage

    OK or NG 

    OK: GO TO 3.

    NG: Repair harness or connector.

  3. CHECK GROUND CIRCUIT 

    Check continuity between BCM harness connector and ground.

    Fig 2: Identifying Continuity Between BCM Connector And Ground
    G05222518Courtesy of NISSAN MOTOR CO., U.S.A.
    GROUND CIRCUIT

    BCM connector Terminal Ground Continuity
    M4 49 Yes
    52

    OK or NG 

    OK: INSPECTION END

    NG: Repair harness or connector.

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