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 angle main control module
  - Chassis control module
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 chassis control module.

Check the continuity between the chassis control module harness connector terminals.

Chassis control module harness connector			Continuity
Connector No.	Terminal No.
E22	11	19	Existed
	8	7	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 (chassis communication circuit side).

CHECK HARNESS FOR OPEN CIRCUIT

Connect the connector of chassis control module.
Disconnect the connector of steering angle main control module.

Check the resistance between the steering angle main control module harness connector terminals.

Steering angle main control module harness connector			Resistance (Ω)
Connector No.	Terminal No.
E26	14	15	Approx. 54 - 66

Is the measurement value within the specification?

YES

GO TO STEP 4 .

Repair the steering angle main control module branch line.

CHECK POWER SUPPLY AND GROUND CIRCUIT

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

Is the inspection result normal?

YES (Present error)

Replace the steering angle main control module. Refer to REMOVAL AND INSTALLATION .

YES (Past error)

Error was detected in the steering angle main control module branch line.

NO

Repair the power supply and the ground circuit.