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.

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).
  - Data link connector
  - Harness connector M133 and the fuse block (J/B) side connector
Is the inspection result normal?

YES

GO TO STEP 2 .

NO

Repair the terminal and connector.

CHECK HARNESS FOR OPEN CIRCUIT

Check the resistance between the data link connector terminals.

Data link connector			Resistance (Ω)
Connector No.	Terminal No.
M25	6	14	Approx. 54 - 66

Is the measurement value within the specification?

YES (Present error)

Check CAN system type decision again.

YES (Past error)

Error was detected in the data link connector branch line (CAN communication circuit 1 side).

GO TO STEP 3 .

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Disconnect the fuse block (J/B) harness connector M133.

Check the continuity between the data link connector and the fuse block (J/B) harness connector.

Data link connector		Fuse block (J/B) harness connector		Continuity
Connector No.	Terminal No.	Connector No.	Terminal No.
M25	6	M133	23C	Existed
	14		5C	Existed

Is the inspection result normal?

YES

Replace the fuse block (J/B).

Repair the harness between the data link connector M25 and the fuse block (J/B) harness connector M133.