Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK LIFTING SENSOR (FRONT) SIGNAL

Turn ignition switch ON.
Read the voltage signal between driver seat control unit harness connector and ground with an oscilloscope.

VOLTAGE REFERENCE CHART

Terminals			Condition		Voltage signal
(+)		(-)
Driver seat control unit connector	Terminal	(-)
B203	19	Ground	Seat lifting (front)	Operate	Courtesy of NISSAN MOTOR CO., U.S.A.
B203	19	Ground	Seat lifting (front)	Other than above	0 or 5

Is the inspection result normal?

YES: GO TO 4

NO: GO TO 2

Fig 1: Checking Voltage Signal Between Driver Seat Control Unit Harness Connector And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK LIFTING SENSOR (FRONT) CIRCUIT

Turn ignition switch OFF.
Disconnect driver seat control unit and front power seat LH [lifting motor (front)].

Check continuity between driver seat control unit harness connector and front power seat LH [lifting motor (front)] harness connector.

CONTINUITY REFERENCE CHART

Driver seat control unit		Front power seat LH [lifting motor (front)]		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B203 (A)	19	B206 (B)	10	Yes

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

Fig 2: Checking Continuity Between Driver Seat Control Unit Harness Connector And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

CONTINUITY REFERENCE CHART

Driver seat control unit		Ground	Continuity
Connector	Terminal
B203 (A)	19		No

Is the inspection result normal?

YES: GO TO 3

NO: Repair or replace harness.

CHECK LIFTING SENSOR (FRONT) POWER SUPPLY

Connect driver seat control unit.
Turn ignition switch ON.
Check the voltage between front power seat LH [lifting motor (front)] harness connector and ground.

VOLTAGE REFERENCE CHART

(+)		(-)	Voltage (V) (Approx.)
Front power seat LH [lifting motor (front)}
Connector	Terminals
B206	9	Ground	Battery voltage

Is the inspection result normal?

YES: GO TO 5

NO: GO TO 4

Fig 3: Checking Voltage Between Front Power Seat LH Lifting Motor (Front) Harness Connector And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK LIFTING SENSOR (FRONT) POWER SUPPLY CIRCUIT

Turn ignition switch OFF.
Disconnect driver seat control unit.

Check the continuity between driver seat control unit harness connector and front power seat LH [lifting motor (front)] harness connector.

CONTINUITY REFERENCE CHART

Driver seat control unit		Front power seat LH [lifting motor (front)]		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B203 (A)	12	B206 (B)	9	Yes

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

CONTINUITY REFERENCE CHART

Driver seat control unit		Ground	Continuity
Connector	Terminal
B203 (A)	12		No

Fig 4: Checking Continuity Between Driver Seat Control Unit Harness Connector And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

Is the inspection result normal?

YES: Replace driver seat control unit. Refer to "REMOVAL AND INSTALLATION ".

NO: Repair or replace harness.

CHECK LIFTING SENSOR (FRONT) GROUND

Turn ignition switch OFF.
Check continuity between front power seat LH [lifting motor (front)] harness connector and ground.

CONTINUITY REFERENCE CHART

Front power seat LH [lifting motor (front)]		Ground	Continuity
Connector	Terminal
B206	15		Yes

Is the inspection result normal?

YES: Replace front power seat LH [lifting motor (front)]. Refer to "REMOVAL AND INSTALLATION ".

NO: Repair or replace harness.

Fig 5: Checking Continuity Between Front Power Seat LH Lifting Motor (Front) Connector And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.