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Home >> Infiniti >> 2015 >> QX80 Base, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Body Control System >> DTC/Circuit Diagnosis >> Combination Switch Input Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK INPUT 1 - 5 CIRCUIT FOR OPEN

    1. Turn ignition switch OFF.
    2. Disconnect BCM and combination switch connectors.
    3. Check continuity between BCM harness connector and combination switch harness connector.
      System BCM Combination switch Continuity
      Connector Terminal Connector Terminal
      INPUT 1 M68 6 M27 12 Existed
      INPUT 2 5 14
      INPUT 3 4 5
      INPUT 4 3 2
      INPUT 5 2 8

    Does continuity exist?

    YES 

    GO TO STEP 2. 

    NO 

    Repair harnesses or connectors.

  2. CHECK INPUT 1 - 5 CIRCUIT FOR SHORT

    Check for continuity between BCM harness connector and ground.

    System BCM Ground Continuity
    Connector Terminal
    INPUT 1 M68 6 Not existed
    INPUT 2 5
    INPUT 3 4
    INPUT 4 3
    INPUT 5 2

    Does continuity exist?

    YES 

    Repair harnesses or connectors.

    NO 

    GO TO STEP 3. 

  3. CHECK BCM INPUT SIGNAL

    1. Connect BCM and combination switch connectors.
    2. Turn ON any switch in the system that is malfunction.
    3. Check voltage between BCM harness connector and ground.
      System Terminals Voltage
      (Approx.)
      (+) (-)
      BCM Ground
      Connector Terminal
      INPUT 1 M68 6 Refer to REFERENCE VALUE .
      INPUT 2 5
      INPUT 3 4
      INPUT 4 3
      INPUT 5 2

    Is the measurement value normal?

    Yes 

    Replace BCM. Refer to REMOVAL AND INSTALLATION .

    No 

    Replace combination switch.

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