Exterior Lighting System (Circuit Diagnosis)

WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

CHECK OPTICAL SENSOR POWER SUPPLY INPUT

Turn the push-button ignition switch OFF.
Disconnect the optical sensor harness connector.
Turn the push-button ignition switch ON.
Turn the lighting switch to AUTO.

Check the voltage between the optical sensor harness connector and ground.

(+)

(-)

Voltage

(Approx.)

Connector

Terminal

M15

Ground

5 V

Is the inspection result normal?

YES

GO TO 2.

GO TO 3.

CHECK OPTICAL SENSOR GROUND CIRCUIT

Turn the push-button ignition switch OFF.

Check continuity between the optical sensor harness connector and ground.

(+)		(-)	Continuity
Connector	Terminal
M15	3	Ground	Yes

Is the inspection result normal?

YES

GO TO 6.

GO TO 5.

CHECK OPTICAL SENSOR POWER SUPPLY CIRCUIT

Turn the push-button ignition switch OFF.
Disconnect the BCM harness connector M18.

Check continuity between optical sensor harness connector and BCM harness connector.

Optical sensor		BCM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M15	1	M18	3	Yes

Is the inspection result normal?

YES

GO TO 4.

Repair or replace the harness or connectors.

CHECK OPTICAL SENSOR POWER SUPPLY FOR SHORT CIRCUIT

Check continuity between optical sensor harness connector and ground.

(+)		(-)	Continuity
Connector	Terminal
M15	1	Ground	No

Is the inspection result normal?

YES

Replace BCM. Refer to Removal and Installation .

Repair or replace harness or connector.

CHECK OPTICAL SENSOR GROUND FOR OPEN CIRCUIT

Turn the push-button ignition switch OFF.
Disconnect the BCM harness connector M18.

Check continuity between optical sensor harness connector and BCM harness connector.

Optical sensor		BCM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M15	3	M18	17	Yes

Is the inspection result normal?

YES

Replace BCM. Refer to Removal and Installation .

Repair or replace harness or connector.

CHECK OPTICAL SENSOR SIGNAL OPEN CIRCUIT

Turn the push-button ignition switch OFF.
Disconnect optical sensor connector and BCM connector M18.

Check continuity between optical sensor harness connector and BCM harness connector.

Optical sensor		BCM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M15	2	M18	4	Yes

Check continuity between optical sensor harness connector and ground.

Connector	Terminal	(-)	Continuity
M15	2	Ground	No

Is the inspection result normal?

YES

Replace the optical sensor. Refer to Removal and Installation .

Repair or replace harness or connectors.