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 RECLINING SENSOR SIGNAL

Turn ignition switch ON.

Read voltage signal between driver seat control unit harness connector and ground with oscilloscope.

(+)		(-)	Condition		Voltage signal
Driver seat control unit
Connector	Terminal
B222	13	Ground	Seat reclining	Operate	Courtesy of NISSAN NORTH AMERICA, INC.
				Other than above	0 or 5V

Is the inspection result normal?

YES

Replace driver seat control unit. Refer to Removal and Installation .

GO TO 2

CHECK RECLINING SENSOR CIRCUIT

Turn ignition switch OFF.
Disconnect driver seat control unit and reclining motor LH.

Check continuity between driver seat control unit harness connector and reclining motor LH harness connector.

Driver seat control unit		Reclining motor LH		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B222	13	B225	1	Yes

Check continuity between driver seat control unit harness connector and ground.

Driver seat control unit		Ground	Continuity
Connector	Terminal
B222	13		No

Is the inspection result normal?

YES

GO TO 3

Repair or replace harness.

CHECK RECLINING SENSOR POWER SUPPLY

Connect driver seat control unit.
Turn ignition switch ON.

Check voltage between reclining motor LH harness connector and ground.

(+)		(-)	Voltage (V) (Approx.)
Reclining motor LH
Connector	Terminal
B225	3	Ground	Battery voltage

Is the inspection result normal?

YES

GO TO 5

GO TO 4

CHECK RECLINING SENSOR POWER SUPPLY CIRCUIT

Turn ignition switch OFF.
Disconnect driver seat control unit.

Check continuity between driver seat control unit harness connector and reclining motor LH harness connector.

Driver seat control unit		Reclining motor LH		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B222	5	B225	3	Yes

Check continuity between driver seat control unit harness connector and ground.

Driver seat control unit		Ground	Continuity
Connector	Terminal
B222	5		No

Is the inspection result normal?

YES

Replace driver seat control unit. Refer to Removal and Installation .

Repair or replace harness.

CHECK RECLINING SENSOR GROUND

Turn ignition switch OFF.

Check continuity between reclining motor LH harness connector and ground.

Reclining motor LH		Ground	Continuity
Connector	Terminal
B225	2		Yes

Is the inspection result normal?

YES

Replace reclining motor LH. Refer to Removal and Installation .

Repair or replace harness.