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Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis >> Electrical >> Motors, Switches, Relays >> Body Control System (DTC/Circuit Diagnosis) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUSES 
    1. Check that the following fuses are not blown:
      Terminal No. Signal name Fuse No. Capacity
      95 Battery power supply 38 5A
      161 2 5A
      167 Battery power supply (door lock 1) 11 20A
      168 Battery power supply (turn signal) 14 10A
      169 Battery power supply (stop lamp) 49 10A
      175 Battery power supply (door lock 2) 12 15A
      176 Battery power supply (wiper) 10 15A

    Is the fuse blown?

    YES>>

    Replace the blown fuse after repairing the affected circuit.

    NO>>

    GO TO 2.

  2. CHECK POWER SUPPLY CIRCUITS 
      1. Disconnect BCM connectors.
      2. Check voltage between BCM harness connectors and ground.
        BCM - Voltage(Approx.)
        Connector Terminal
        M20 161 Ground Battery voltage
        167
        168
        169
        175
        176
        M304 95

    Is the inspection result normal?

    YES>>

    GO TO 3.

    NO>>

    Repair or replace harness or connectors.

  3. CHECK GROUND CIRCUIT 
    1. Check continuity between BCM harness connector and ground.
      BCM - Continuity
      Connector Terminal
      M20 170 Ground Yes
      171

    Is the inspection result normal?

    YES>>

    Inspection End.

    NO>>

    Repair or replace harness or connectors.