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Home >> Infiniti >> 2015 >> Q50 Base, RWD >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Body Control System (Exc Hybrid) >> DTC/Circuit Diagnosis >> Combination Switch Output Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK OUTPUT 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
      OUTPUT 1 M13 14 M27 12 Existed
      OUTPUT 2 13 14
      OUTPUT 3 12 5
      OUTPUT 4 11 2
      OUTPUT 5 10 8

    Does continuity exist?

    YES 

    GO TO STEP 2. 

    NO 

    Repair harnesses or connectors.

  2. CHECK OUTPUT 1 - 5 CIRCUIT FOR SHORT

    Check for continuity between BCM harness connector and ground.

    System BCM Ground Continuity
    Connector Terminal
    OUTPUT 1 M13 14 Not existed
    OUTPUT 2 13
    OUTPUT 3 12
    OUTPUT 4 11
    OUTPUT 5 10

    Does continuity exist?

    YES 

    Repair harnesses or connectors.

    NO 

    GO TO STEP 3. 

  3. CHECK COMBINATION SWITCH INTERNAL CIRCUIT

    1. Connect BCM connector.
    2. Turn ON any switch in the system that is malfunctioning.
    3. Check voltage between BCM harness connector and ground.
      NOTE:

      Check that the combination switch outputs a signal from combination switch input system.

      System (+) (-) Voltage
      (Approx.)
      BCM
      Connector Terminal
      OUTPUT 1 M27 12 Ground Refer to REFERENCE VALUE .
      OUTPUT 2 14
      OUTPUT 3 5
      OUTPUT 4 2
      OUTPUT 5 8

    Is the measurement value normal?

    YES 

    Replace BCM. Refer to REMOVAL AND INSTALLATION .

    NO 

    Replace combination switch. Refer to REMOVAL AND INSTALLATION .

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