Diagnosis Procedure

1. CHECK LIFTING SWITCH SIGNAL
   1. Turn ignition switch OFF.
   2. Check voltage between driver seat control unit harness connector and ground.
   VOLTAGE REFERENCE CHART
   
   

   Driver seat control unit connector	Terminals		Condition		Voltage (V) (Approx.)
   	(+)	(-)
   B203	10	Ground	Lifting switch (front)	Operate (down)	0V
   				Release	Battery voltage
   	26			Operate (up)	0V
   				Release	Battery voltage

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

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

   Is the inspection result normal? 

   YES: GO TO  5

   NO: GO TO 2

2. CHECK LIFTING SWITCH (FRONT) CIRCUIT
   1. Turn ignition switch OFF.
   2. Disconnect driver seat control unit and power seat switch LH.
   3. Check continuity between driver seat control unit harness connector and power seat switch LH harness connector.
      CONTINUITY REFERENCE CHART
      
      

      Driver seat control unit connector	Terminal	Power seat switch LH connector	Terminal	Continuity
      B203 (A)	10	B213 (B)	1	Yes
      	26		2

      Fig 2: Checking Continuity Between Driver Seat Control Unit Connector And Power Seat Switch LH Connector

      Courtesy of NISSAN MOTOR CO., U.S.A.
   4. Check continuity between driver seat control unit harness connector and ground.
   CONTINUITY REFERENCE CHART
   
   

   Driver seat control unit connector	Terminal	Ground	Continuity
   B203 (A)	10		No
   	26

   Is the inspection result normal? 

   YES: GO TO 3

   NO: Repair or replace harness.

3. CHECK DRIVER SEAT CONTROL UNIT OUTPUT
   1. Connect the driver seat control unit.
   2. Turn ignition switch ON.
   3. Check voltage between driver seat control unit harness connector and ground.
   VOLTAGE REFERENCE CHART
   
   

   Driver seat control unit connector	Terminals		Voltage (V) (Approx.)
   	(+)	(-)
   B203 (A)	10	Ground	Battery voltage
   	26

   Is the inspection result normal? 

   YES: GO TO 4

   NO: Replace driver seat control unit. Refer to "REMOVAL AND INSTALLATION ".

   Fig 3: Checking Voltage Between Driver Seat Control Unit Harness Connector And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. CHECK LIFTING SWITCH (FRONT)

   Refer to "COMPONENT INSPECTION ".

   Is the inspection result normal? 

   YES: GO TO 5

   NO: Replace power seat switch LH. Refer to "DRIVER SIDE: DISASSEMBLY AND ASSEMBLY ".

5. CHECK INTERMITTENT INCIDENT

Refer to "INTERMITTENT INCIDENT ".

Is the inspection result normal? 

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

NO: Repair or replace the malfunctioning part.