Diagnosis Procedure

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 POWER SOURCE (STOP LAMP SWITCH)

Turn ignition switch OFF.
Disconnect stop lamp switch connector.

Check voltage between stop lamp switch connector E38 terminal 1 and ground.

Stop lamp switch		Ground	Voltage (Approx.)
Connector	Terminal
E38	1		Battery voltage

Is the inspection result normal?

YES

GO TO 2.

Check the following:

Harness for short or open between fuse block (J/B) and stop lamp switch
10A fuse (No. 10, located in fuse block [J/B])

CHECK STOP LAMP SWITCH
Check stop lamp switch. Refer to Component Inspection (Stop Lamp Switch) (RE0F10J).

Is the inspection result normal?

YES

GO TO 3.

NO

Replace stop lamp switch. Refer to Exploded View .

CHECK GROUND CIRCUIT (BCM)

Disconnect BCM connector M81.

Check continuity between BCM connector M81 terminals 134, 143 and ground.

BCM		Ground	Continuity
Connector	Terminal (+)
M81	134		Yes
	143

Is the inspection result normal?

YES

GO TO 4.

Repair or replace damaged parts.

CHECK HARNESS BETWEEN BCM AND STOP LAMP SWITCH FOR OPEN

Disconnect BCM connector M18.

Check continuity between BCM connector M18 terminal 27 and stop lamp switch connector E38 terminal 2.

BCM		Stop lamp switch		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M18	27	E38	2	Yes

Is the inspection result normal?

YES

GO TO 5.

Repair or replace damaged parts.

CHECK HARNESS BETWEEN BCM AND STOP LAMP SWITCH FOR SHORT CIRCUIT

Check continuity between BCM connector M18 terminal 27 and ground.

BCM		Ground	Continuity
Connector	Terminal
M18	27		No

Is the inspection result normal?

YES

GO TO 6.

Repair or replace damaged parts.

CHECK HARNESS BETWEEN BCM AND CVT SHIFT SELECTOR FOR OPEN

Disconnect CVT shift selector connector M78 and BCM connector M80.

Check continuity between BCM connector M80 terminal 108 and CVT shift selector connector M78 terminal 3.

BCM		CVT shift selector		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M80	108	M78	3	Yes

Is the inspection result normal?

YES

GO TO 7.

Repair or replace damaged parts.

CHECK HARNESS BETWEEN BCM AND CVT SHIFT SELECTOR FOR SHORT CIRCUIT

Check continuity between BCM connector M80 terminal 108 and ground.

BCM		Ground	Continuity
Connector	Terminal
M80	108		No

Is the inspection result normal?

YES

GO TO 8.

Repair or replace damaged parts.

CHECK GROUND CIRCUIT (CVT SHIFT SELECTOR)

Check continuity between CVT shift selector connector M78 terminal 4 and ground.

CVT shift selector		Ground	Continuity
Connector	Terminal
M78	4		Yes

Is the inspection result normal?

YES

Replace CVT shift selector. Refer to Removal and Installation (RE0F10J).

Repair or replace damaged parts.