Check Unlock Sensor

CHECK UNLOCK SENSOR POWER SUPPLY

Check voltage between Intelligent Key unit connector and ground.

Fig 1: Identifying Voltage Between Intelligent Key Unit Connector And Ground

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

UNLOCK SENSOR POWER SUPPLY

Connector	Terminals (Wire color)		Condition	Voltage (V) (Approx.)
Connector	(+)	(-)	Condition	Voltage (V) (Approx.)
M34	28 (W/B)	Ground	Driver side door lock is locked	5
M34	28 (W/B)	Ground	Driver side door lock is unlocked	0

OK or NG

OK: Unlock sensor is OK.

NG: GO TO 2.

CHECK UNLOCK SENSOR CIRCUIT
1. Turn ignition knob LOCK position.
2. Disconnect Intelligent Key unit and front door lock assembly (driver side) connector.
3. Check continuity between Intelligent Key unit connector M34 terminal 28 (W/B) and front door lock assembly (driver side) connector D10 terminal 4 (W).
  28 (W/B) - 4 (W) : Continuity should exist.
  
  Fig 2: Identifying Continuity Between Intelligent Key Unit Connector M34 Terminal 28 And Front Door Lock Assembly Connector D10 Terminal 4
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK: GO TO 3.

NG: Repair or replace harness between Intelligent Key unit and front door lock assembly (driver side).
CHECK UNLOCK SENSOR GROUND CIRCUIT
Check continuity between front door lock assembly (driver side) connector D10 terminal 5 (B) and ground.

5 (B) - Ground : Continuity should exist.

Fig 3: Identifying Continuity Between Front Door Lock Assembly Connector D10 Terminal 5 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 4.

NG: Repair or replace harness.
CHECK INTELLIGENT KEY UNIT OUTPUT SIGNAL
1. Connect Intelligent Key unit connector.
2. Driver side door lock is locked.
3. Check voltage between Intelligent Key unit connector M34 terminal 28 (W/B) and ground.
  28 (W/B) - Ground : Approx. 5V
  
  Fig 4: Identifying Voltage Between Intelligent Key Unit Connector M34 Terminal 28 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK: Replace front door lock assembly (driver side).

NG: Replace Intelligent Key unit.