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Home >> Infiniti >> 2013 >> QX56 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (LAN System (Can)) >> DTC/Circuit Diagnosis >> Main Line Between ADP And Abs Circuit >> Diagnosis Procedure
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Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Infiniti M56 and 2013 Infiniti M37. 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 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 B1
      • Harness connector M7
      • Harness connector M6
      • Harness connector E106

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair the terminal and connector.

  2. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) 
    1. Disconnect the harness connectors B1 and M7.
    2. Check the continuity between the harness connector terminals.
      Connector No. Terminal No. Continuity
      B1 72 74 Existed
      73 75 Existed

      Is the inspection result normal? 

      YES: GO TO 3.

      NO-1: With 4WAS or AWD models: Replace the body harness.

      NO-2: 2WD models without 4WAS: Repair the main line between the driver seat control unit and the harness connector B1.

  3. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) 
    1. Disconnect the harness connectors M6 and E106.
    2. Check the continuity between the harness connectors.
      Harness connector Harness connector Continuity
      Connector No. Terminal No. Connector No. Terminal No.
      M7 74 M6 22 Existed
      75 23 Existed

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Repair the main line between the harness connectors M7 and M6.

  4. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) 
    1. Disconnect the connector of ABS actuator and electric unit (control unit).
    2. Check the continuity between the harness connector and the ABS actuator and electric unit (control unit) harness connector.
      Harness connector ABS actuator and electric unit (control unit) harness connector Continuity
      Connector No. Terminal No. Connector No. Terminal No.
      E106 22 E41 25 Existed
      23 15 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 driver seat control unit and the ABS actuator and electric unit (control unit).

      NO: Repair the main line between the harness connector E106 and the ABS actuator and electric unit (control unit).

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