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 (unit side and connector side).
  - Steering force control module
  - CAN gateway
Is the inspection result normal?

YES

GO TO STEP 2 .

NO

Repair the terminal and connector.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Disconnect the connector of CAN gateway.

Check the continuity between the CAN gateway harness connector terminals.

CAN gateway harness connector			Continuity
Connector No.	Terminal No.
M24	4	6	Existed
	10	12	Existed

Is the inspection result normal?

YES

GO TO STEP 3 .

Check the harness and repair or replace [if shield line or fuse block (J/B) is open] the root cause (CAN communication circuit 2 side).

CHECK HARNESS FOR OPEN CIRCUIT

Connect the connector of CAN gateway.
Disconnect the connector of steering force control module.

Check the resistance between the steering force control module harness connector terminals.

Steering force control module harness connector			Resistance (Ω)
Connector No.	Terminal No.
M71	14	15	Approx. 54 - 66

Is the measurement value within the specification?

YES

GO TO STEP 4 .

Repair the steering force control module branch line.

CHECK POWER SUPPLY AND GROUND CIRCUIT

Check the power supply and the ground circuit of the steering force control module. Refer to DIAGNOSIS PROCEDURE .

Is the inspection result normal?

YES (Present error)

Replace the steering force control module. Refer to REMOVAL AND INSTALLATION .

YES (Past error)

Error was detected in the steering force control module branch line.

NO

Repair the power supply and the ground circuit.