Driver Seat Control Unit And Automatic Drive Positioner Control Unit Power Supply And Ground Circuit Inspection

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

FUSE INSPECTION

Make sure none of the following fuses or fusible link for the driver seat control unit and automatic drive positioner control unit are blown.

FUSES INSPECTION REFERENCE

Unit	Power source	Fuse No.
Driver seat control unit	START power supply	9 (10A)
Driver seat control unit and automatic drive positioner control unit	Battery power supply	3 (10A)
	Battery power supply	f (50A)

OK or NG

OK: GO TO 2.

NG: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Refer to "HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT ".

CHECK DRIVER SEAT CONTROL UNIT POWER SUPPLY CIRCUIT

Disconnect driver seat control unit.
Check voltage between driver seat control unit and ground.

DRIVER SEAT CONTROL UNIT POWER SUPPLY CIRCUIT

Connector	Terminals		Power source	Condition	Voltage (V) (Approx.)
Connector	(+)	(+)	Power source	Condition	Voltage (V) (Approx.)
B402	33, 40	Ground	Battery power supply	Ignition switch OFF	Battery voltage
B401	6	Ground	START power supply	Ignition switch START	Battery voltage

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

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

OK or NG

OK: GO TO 3.

NG: Check harness for open and short between driver seat control unit and fuse block (J/B).

CHECK DRIVER SEAT CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between the driver seat control unit connector B401 terminal 32, B402 terminal 48 and ground.
  32 - Ground: Continuity should exist.
  
  48 - Ground: Continuity should exist.
Fig 2: Checking Continuity Between Driver Seat Control Unit Connector B401 Terminal 32, B402 Terminal 48 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 4.

NG: Repair or replace harness.
CHECK AUTOMATIC DRIVE POSITIONER CONTROL UNIT POWER SUPPLY CIRCUIT
1. Disconnect automatic drive positioner control unit.
2. Check voltage between automatic drive positioner control unit connector M42 terminals 34, 39 and ground.
  34 - Ground: Battery voltage
  
  39 - Ground: Battery voltage
Fig 3: Checking Voltage Between Automatic Drive Positioner Control Unit Connector Terminals And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 5.

NG: Repair or replace harness.
CHECK AUTOMATIC DRIVE POSITIONER CONTROL UNIT GROUND CIRCUIT
Check continuity between the automatic drive positioner control unit connector M42 terminals 40, 48 and ground.

40 - Ground: Continuity should exist.

48 - Ground: Continuity should exist.

Fig 4: Checking Continuity Between Automatic Drive Positioner Control Unit Connector Terminals And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: Automatic drive positioner control unit circuit is OK.

NG: Repair or replace harness.