Diagnosis Procedure

1. Turn ignition switch ON.
2. Check voltage signal between driver seat control unit connector and ground with oscilloscope.

(+)		(-)	Condition		Voltage (V) (Approx.)
Driver seat control unit
Connector	Terminal
B222	28	Ground	Steering column	Operate	Courtesy of NISSAN NORTH AMERICA, INC.
				Other than above	0 or 5

Is the inspection result normal?

YES

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

NO

GO TO 2

1. Turn ignition switch OFF.
2. Disconnect driver seat control unit and tilt motor.
3. Check continuity between driver seat control unit harness connector and tilt motor harness connector.

   Driver seat control unit		Tilt motor		Continuity
   Connector	Terminal	Connector	Terminal
   B222	28	M71	5	Yes

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

   Driver seat control unit		Ground	Continuity
   Connector	Terminal
   B222	28		No

Is the inspection result normal?

YES

GO TO 3

NO

Repair or replace harness.

1. Connect driver seat control unit.
2. Turn ignition switch ON.
3. Check voltage between tilt motor harness connector and ground.

   (+)		(-)	Voltage (V) (Approx.)
   Tilt motor
   Connector	Terminal
   M71	4	Ground	Battery voltage

Is the inspection result normal?

YES

GO TO 5

NO

GO TO 4

1. Turn ignition switch OFF.
2. Disconnect automatic drive positioner control unit.
3. Check continuity between automatic drive positioner control unit harness connector and tilt motor harness connector.

   Automatic drive positioner control unit		Tilt motor		Continuity
   Connector	Terminal	Connector	Terminal
   M67	27	M71	4	Yes

4. Check continuity between automatic drive positioner control unit harness connector and ground.

   Automatic drive positioner control unit		Ground	Continuity
   Connector	Terminal
   M67	27		No

Is the inspection result normal?

YES

Replace automatic drive positioner control unit. Refer to Removal and Installation .

NO

Repair or replace harness or connector.

1. Turn ignition switch OFF.
2. Disconnect automatic drive positioner control unit.
3. Check continuity between automatic drive positioner control unit harness connector and tilt motor harness connector.

   Automatic drive positioner control unit		Tilt motor		Continuity
   Connector	Terminal	Connector	Terminal
   M63	20	M71	6	Yes

Is the inspection result normal?

YES

Replace tilt motor. Refer to Removal and Installation .

NO

Repair or replace harness.