Power Supply And Ground Circuit Inspection

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

CHECK BCM FUSES AND FUSIBLE LINK
Refer to "BCM POWER SUPPLY AND GROUND CIRCUIT CHECK ".

OK or NG

OK: GO TO 2.

NG: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse

CHECK CONTROL UNIT FUSES AND FUSIBLE LINK

Check if any of the following fuses or fusible link for the driver seat control unit and automatic drive positioner control unit are blown.

CONTROL UNIT FUSES AND FUSIBLE LINK

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	22 (10A)
	Battery power supply	g (50A)

OK or NG

OK: GO TO 3.

NG: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.

CHECK DRIVER SEAT CONTROL UNIT POWER SUPPLY CIRCUIT

Disconnect driver seat control unit.

Check voltage between driver seat control unit connector and ground.

TERMINALS VOLTAGE REFERENCE

Connector	Terminals		Power source	Condition	Voltage (V) (Approx.)
Connector	(+)	(-)	Power source	Condition	Voltage (V) (Approx.)
P3	33	Ground	Battery power supply	Ignition switch OFF	Battery voltage
P3	40	Ground	Battery power supply	Ignition switch OFF	Battery voltage
P2	6	Ground	START power supply	Ignition switch START	Battery voltage

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

OK or NG

OK: GO TO 4.

NG: Repair or replace harness.

CHECK DRIVER SEAT CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between the driver seat control unit connector P2 terminal 32, P3 terminal 48 and ground.
  32 - Ground : Continuity should exist.
  
  48 - Ground : Continuity should exist.
  
  Fig 2: Checking Continuity Between Driver Seat Control Unit Connector P2 Terminal 32 And Ground
OK or NG

OK: Driver seat control unit circuit check is OK. Check the automatic drive positioner control unit. GO TO 5.

NG: Repair or replace harness.

CHECK AUTOMATIC DRIVE POSITIONER CONTROL UNIT POWER SUPPLY CIRCUIT

Disconnect automatic drive positioner control unit.

Check voltage between automatic drive positioner control unit connector M34 terminal 34, 39 and ground.

TERMINALS VOLTAGE REFERENCE

Connector	Terminals		Condition	Voltage (V) (Approx.)
Connector	(+)	(-)	Condition	Voltage (V) (Approx.)
M34	34	Ground	Ignition switch OFF	Battery voltage
M34	39	Ground	Ignition switch OFF	Battery voltage

Fig 3: Checking Voltage Between Automatic Drive Positioner Control Unit Connector M34 Terminal 34 And Ground

OK or NG

OK: GO TO 6.

NG: Repair or replace harness.

CHECK AUTOMATIC DRIVE POSITIONER CONTROL UNIT GROUND CIRCUIT
Check continuity between the automatic drive positioner control unit connector M34 terminal 40, 48 and ground.

40 - Ground : Continuity should exist.

48 - Ground : Continuity should exist.

OK or NG

OK: Automatic drive positioner control unit circuit is OK.

NG: Repair or replace harness.

Fig 4: Checking Continuity Between Automatic Drive Positioner Control Unit Connector M34 Terminal 40 And Ground