Diagnosis Procedure

WARNING: This page is about a different car, the 2020 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.

CHECK ENCODER SIGNAL

Turn ignition switch ON.

Check signal between rear power window switch LH harness connector and ground with oscilloscope.

(+)		(-)	Signal (Reference value)
Rear power window switch LH
Connector	Terminal
D33	12	Ground	Refer to following signal
	15

Courtesy of NISSAN NORTH AMERICA, INC.

Is the inspection result normal?

YES

Replace rear power window switch LH. Refer to REAR POWER WINDOW SWITCH : Removal & Installation .

GO TO 2.

CHECK ENCODER SIGNAL CIRCUIT

Turn ignition switch OFF.
Disconnect rear power window switch LH connector and rear power window motor LH connector.

Check continuity between rear power window switch LH harness connector and rear power window motor LH harness connector.

Rear power window switch LH		Rear power window motor LH		Continuity
Connector	Terminal	Connector	Terminal
D33	12	D36	4	Existed
	15		6

Check continuity rear power window switch LH harness connector and ground.

Rear power window switch LH		Ground	Continuity
Connector	Terminal
D33	12		Not existed
	15

Is the inspection result normal?

YES

GO TO 3.

Repair or replace harness.

CHECK ENCODER POWER SUPPLY CIRCUIT 1

Connect rear power window switch LH connector.
Turn ignition switch ON.

Check voltage between rear power window motor LH harness connector and ground.

(+)		(-)	Voltage (V)
Rear power window motor LH
Connector	Terminal
D36	5	Ground	9 - 16

Is the inspection result normal?

YES

GO TO 5.

GO TO 4.

CHECK ENCODER POWER SUPPLY CIRCUIT2

Turn ignition switch OFF.
Disconnect rear power window switch LH connector.

Check continuity between rear power window switch LH harness connector and rear power window motor LH harness connector.

Rear power window switch LH		Rear power window motor LH		Continuity
Connector	Terminal	Connector	Terminal	Continuity
D33	4	D36	5	Existed

Check continuity between rear power window switch LH harness connector and ground.

Rear power window switch LH		Ground	Continuity
Connector	Terminal
D33	4		Not existed

Is the inspection result normal?

YES

Replace rear power window switch LH. Refer to REAR POWER WINDOW SWITCH : Removal & Installation .

Repair or replace harness.

CHECK GROUND CIRCUIT 1

Turn ignition switch OFF.
Disconnect rear power window switch LH harness connector.

Check continuity between rear power window switch LH harness connector and rear power window motor LH harness connector.

Rear power window switch LH		Rear power window motor LH		Continuity
Connector	Terminal	Connector	Terminal	Continuity
D33	3	D36	3	Existed

Is the inspection result normal?

YES

GO TO 6.

Repair or replace harness.

CHECK GROUND CIRCUIT 2

Connect rear power window switch LH connector.

Check continuity between rear power window switch LH connector and ground.

Rear power window switch LH		Ground	Continuity
Connector	Terminal
D33	3		Existed

Is the inspection result normal?

YES

Replace rear power window motor LH. Refer to REAR REGULATOR : Removal & Installation .

Replace rear power window switch LH. Refer to REAR POWER WINDOW SWITCH : Removal & Installation .