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Home >> Infiniti >> 2015 >> Q50 Base, RWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> LAN System (Can) (Exc Hybrid) >> DTC/Circuit Diagnosis >> BCM Branch Line Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK CONNECTOR

    1. Turn the ignition switch OFF.
    2. Disconnect the battery cable from the negative terminal.
    3. Check the terminals and connectors of the BCM for damage, bend and loose connection (unit side and connector side).

    Is the inspection result normal?

    YES 

    GO TO STEP 2  .

    NO 

    Repair the terminal and connector.

  2. CHECK HARNESS FOR OPEN CIRCUIT

    1. Disconnect the connector of BCM.
    2. Check the resistance between the BCM harness connector terminals.
      BCM harness connector Resistance (Ω)
      Connector No. Terminal No.
      M14 60 59 Approx. 108 - 132

    Is the measurement value within the specification?

    YES 

    GO TO STEP 3  .

    NO 

    Repair the BCM branch line.

  3. CHECK POWER SUPPLY AND GROUND CIRCUIT

    Check the power supply and the ground circuit of the BCM. Refer to DIAGNOSIS PROCEDURE .

    Is the inspection result normal?

    YES (Present error) 

    Replace the BCM. Refer to REMOVAL AND INSTALLATION .

    YES (Past error) 

    Error was detected in the BCM branch line.

    NO 

    Repair the power supply and the ground circuit.

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