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.
- CHECK CONNECTOR
- Turn the ignition switch OFF.
- Disconnect the battery cable from the negative terminal.
- Check the following terminals and connectors for damage, bend and loose connection (connector side and harness side).
- Harness connector M20 and PCB harness side connector
- Harness connector M7
- Harness connector B1
Is the inspection result normal?
YES: GO TO 2.
NO: Repair the terminal and connector.
- CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
- Disconnect the following harness connectors.
- BCM
- Harness connector M20
- Check the continuity between the BCM harness connector and the PCB harness connector.
BCM harness connector PCB harness connector Continuity Connector No. Terminal No. Terminal No. M120 39 35 Existed 40 36 Existed Is the inspection result normal?
YES: GO TO 3.
NO: Replace the PCB harness.
- Disconnect the following harness connectors.
- CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
- Disconnect the harness connectors M7 and B1.
- Check the continuity between the harness connectors.
Harness connector Harness connector Continuity Connector No. Terminal No. Connector No. Terminal No. M20 35 M7 72 Existed 36 73 Existed Is the inspection result normal?
YES: GO TO 4.
NO: Repair the main line between the harness connectors M20 and M7.
- CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
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 (Present error): Check CAN system type decision again.
YES (Past error): Error was detected in the main line between the BCM and the driver seat control unit.
NO-1: With 4WAS or AWD models: Replace the body harness.
NO-2: 2WD models without 4WAS: Repair the main line between the harness connector B1 and the driver seat control unit.