Lifting Motor (Front) Circuit Inspection

WARNING: This page is about a different car, the 2008 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FRONT END SEAT LIFTING MECHANISM
Check the following.
- Operation malfunction caused by lifter mechanism deformation, pinched harness or other foreign materials
- Operation malfunction caused by foreign materials adhered to the lifting motor (front) or lead screws
- Operation malfunction and interference with other parts by installation
OK or NG

OK: GO TO 2.

NG: Repair the malfunctioning part and check again.

CHECK FUNCTION

With CONSULT-III

Check operation with "SEAT LIFTER FR" in ACTIVE TEST.

ACTIVE TEST REFERENCE

Test item	Description
SEAT LIFTER FR	The lifting motor (front) is activated by receiving the drive signal.

Without CONSULT-III

GO TO 3.

OK or NG

OK: Lifting motor (front) circuit is OK.

NG: GO TO 3.

CHECK LIFTING MOTOR (FRONT) CIRCUIT HARNESS CONTINUITY
1. Turn ignition switch OFF.
2. Disconnect driver seat control unit and lifting motor (front).
3. Check continuity between driver seat control unit connector B402 terminals 37, 45 and lifting motor (front) connector B405 terminals 4, 6.
  37 - 6 : Continuity should exist.
  
  45 - 4 : Continuity should exist.
4. Check continuity between driver seat control unit connector B402 terminals 37, 45 and ground.
  37 - Ground : Continuity should not exist.
  
  45 - Ground : Continuity should not exist.
OK or NG

OK: GO TO 4.

NG: Repair or replace harness.

Fig 1: Checking Continuity Between Driver Seat Control Unit Connector Terminals And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK DRIVER SEAT CONTROL UNIT OUTPUT SIGNAL

Connect the driver seat control unit and lifting motor (front).

Check voltage between driver seat control unit connector and ground.

TERMINALS VOLTAGE CHART

Connector	Terminals		Condition	Voltage (V) (Approx.)
Connector	(+)	(-)	Condition	Voltage (V) (Approx.)
B402	37	Ground	Lifting switch (front) ON (DOWN operation)	Battery voltage
	37		Other than above	0
	45		Lifting switch (front) ON (UP operation)	Battery voltage
	45		Other than above	0

OK or NG

OK: Replace lifting motor (front). Refer to "FRONT SEAT ".

NG: Replace driver seat control unit. Refer to "FRONT SEAT ".

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

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