Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

1. CHECK LIFTING SENSOR (FRONT) SIGNAL
   1. Turn ignition switch ON.
   2. Read the voltage signal between driver seat control unit harness connector and ground with an oscilloscope.

      Terminals			Condition		Voltage signal
      (+)		(-)
      Driver seat control unit connector	Terminal
      B202	25	Ground	Seat lifting (front)	Operate
      				Other than above	0 or 5

      Fig 1: Checking Voltage Signal Between Driver Seat Control Unit Harness Connector B202 And Ground Using Oscilloscope

      Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO  4

      NO: GO TO 2

2. CHECK LIFTING SENSOR (FRONT) CIRCUIT
   1. Turn ignition switch OFF.
   2. Disconnect driver seat control unit and lifting motor (front).
   3. Check continuity between driver seat control unit harness connector and lifting motor (front) harness connector.

      Driver seat control unit connector	Terminal	Lifting motor (front) connector	Terminal	Continuity
      B202 (A)	16	B206 (B)	3	Yes
      	25		4
      	31		2

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

      Driver seat control unit connector	Terminal	Ground	Continuity
      B202 (A)	16		No
      	25
      	31

      Fig 2: Checking Continuity Between Driver Seat Control Unit Harness Connector B202 And Lifting Motor (Front) Connector B206

      Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO 3

      NO: Repair or replace harness.

3. CHECK SEAT OPERATION
   1. Connect driver seat control unit and lifting motor (front).
   2. Check seat operation [except lifting (front) operation] with memory function.

      Is the operation normal? 

      YES: Replace lifting motor (front). Refer to "EXPLODED VIEW ".

      NO: Replace driver seat control unit. Refer to "EXPLODED VIEW ".

4. CHECK INTERMITTENT INCIDENT

   Refer to "INTERMITTENT INCIDENT ".

   Is the inspection result normal? 

   YES: Replace driver seat control unit. Refer to "EXPLODED VIEW ".

   NO: Repair or replace the malfunctioning part.