Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Maxima. 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 battery cable from the negative terminal.
3. Check the following terminals and connectors of the sonar control unit for damage, bend and loose connection (unit side and connector side).
Is the inspection result normal?

YES

GO TO 2 .

YES

GO TO 3 .

NO

Repair the terminal and connector.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Disconnect the connector of ADAS control unit.

Check the continuity between the ADAS control unit.

ADAS control unit harness connector			Continuity
Connector No.	Terminal No.
B89	2	6	Existed
	5	18	Existed

Is the inspection result normal?

YES

GO TO 3 .

Check the harness and repair or replace the root cause (ITS CAN communication circuit side).

CHECK HARNESS FOR OPEN CIRCUIT

Disconnect the connector of sonar control unit.

Check the resistance between the sonar control unit harness connector terminals.

Without driver assistance system

Sonar control unit harness connector			Resistance (Ω)
Connector No.	Terminal No.
M122	5	6	Approx. 54 - 66

With driver assistance system

Sonar control unit harness connector			Resistance (Ω)
Connector No.	Terminal No.
M187	19	20	Approx. 54 - 66

Is the measurement value within the specification?

YES

GO TO 4 .

Repair the sonar control unit branch line.

CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the sonar control unit. Refer to Diagnosis Procedure .

Is the inspection result normal?

YES

Replace the sonar control unit. Refer to Removal and Installation .

YES

Error was detected in the sonar control unit branch line.

NO

Repair the power supply and the ground circuit.