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Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can System (DTC/Circuit Diagnosis) >> Circuit Diagnosis >> DAST 1 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 steering angle main control module for damage, bend and loose connection (unit side and connector side).

    Is the inspection result normal?

    >>

    GO TO 2.

    >>

    Repair the terminal and connector.

  2. CHECK HARNESS FOR OPEN CIRCUIT 
    1. Disconnect the connector of steering angle main control module.
    2. Check the resistance between the steering angle main control module harness connector terminals.
      Steering angle main control module harness connector Resistance (Ω)
      Connector No. Terminal No.
      E149 14 15 Approx. 54 - 66

    Is the measurement value within the specification?

    >>

    GO TO 3.

    >>

    Repair the steering angle main control module branch line.

  3. CHECK POWER SUPPLY AND GROUND CIRCUIT 

    Check the power supply and the ground circuit of the steering angle main control module. Refer to Diagnosis Procedure .

    Is the inspection result normal?

    >>

    Replace the steering angle main control module. Refer to Removal and Installation .

    >>

    Error was detected in the steering angle main control module branch line.

    >>

    Repair the power supply and the ground circuit.

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