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Home >> Infiniti >> 2017 >> QX70 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 183 (LAN System (Can) (Wiring Diagrams And Circuit Diagnosis) (Hybrid)) >> Circuit Diagnosis >> Main Line Between DAST 1 And ICC Circuit >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.

  1. CHECK CONNECTOR

    1. Turn the ignition switch OFF.
    2. Disconnect the 12V battery cable from the negative terminal.
    3. Check the following terminals and connectors for damage, bend and loose connection (connector side and harness side).
      • Harness connector E25
      • Harness connector M40
      • Harness connector M19
      • Harness connector B18
      • Harness connector B30
      • Harness connector T3

    Is the inspection result normal?

    YES 

    GO TO STEP 2  .

    NO 

    Repair the terminal and connector.

  2. CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

    1. Disconnect the following harness connectors.
      • Steering angle main control module
      • Harness connectors E25 and M40
    2. Check the continuity between the steering angle main control module harness connector and the harness connector.
      Steering angle main control module harness connector Harness connector Continuity
      Connector No. Terminal No. Connector No. Terminal No.
      E26 14 E25 51 Existed
      15 52 Existed

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    Repair the main line between the steering angle main control module harness connector and the harness connector E25.

  3. CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

    1. Disconnect the harness connector M19 and B18.
    2. Check the continuity between the harness connectors terminals.
      Harness connector Harness connector Continuity
      Connector No. Terminal No. Connector No. Terminal No.
      M40 51 M19 74 Existed
      52 75 Existed

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    Repair the main line between the harness connectors M40 and M19.

  4. CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

    1. Disconnect the harness connector B30 and T3.
    2. Check the continuity between the harness connectors terminals.
    Harness connector Harness connector Continuity
    Connector No. Terminal No. Connector No. Terminal No.
    B18 74 B30 13 Existed
    75 14 Existed

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Repair the main line between the harness connectors B18 and B30.

  5. CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

    1. Disconnect the ADAS control unit harness connector.
    2. Check the continuity between the harness connector and the ADAS control unit harness connector.
    Harness connector ADAS control unit harness connector Continuity
    Connector No. Terminal No. Connector No. Terminal No.
    T3 13 T18 8 Existed
    14 9 Existed

    Is the inspection result normal?

    YES (Present error) 

    Check CAN system type decision again.

    YES (Past error) 

    Error was detected in the main line between the steering angle main control module and the ADAS control unit.

    NO 

    Replace the tail harness.

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