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 BACK DOOR SWITCH INPUT SIGNAL

Turn ignition switch OFF.
Disconnect back door lock assembly connector.

Check signal between back door lock assembly harness connector and ground using oscilloscope.

(+)		(-)	Signal (Reference value)
Back door lock assembly
Connector	Terminal
D557	7	Ground	Courtesy of NISSAN NORTH AMERICA, INC. 11.8 V

Is the inspection result normal?

YES

GO TO 3.

GO TO 2.

CHECK BACK DOOR SWITCH CIRCUIT

Disconnect BCM connector.

Check continuity between back door lock assembly harness connector and BCM harness connector.

Back door lock assembly		BCM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
D557	7	M20	97	Yes

Check continuity between back door lock assembly harness connector and ground.

Back door lock assembly		Ground	Continuity
Connector	Terminal
D557	7		No

Is the inspection result normal?

YES

Replace BCM. Refer to Removal and Installation .

Repair or replace harness.

CHECK BACK DOOR SWITCH GROUND CIRCUIT

Check continuity between back door lock assembly harness connector and ground.

Back door lock assembly		Ground	Continuity
Connector	Terminal
D557	8		Yes

Is the inspection result normal?

YES

GO TO 4.

Repair or replace harness.

CHECK BACK DOOR SWITCH
Refer to Component Inspection .

Is the inspection result normal?

YES

GO TO 5.

NO

Replace back door lock assembly. Refer to Removal and Installation .
CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident .

Inspection End.