Front Door Lock Assembly LH (Door Unlock Sensor) Check

WARNING: This page is about a different car, the 2009 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

CHECK UNLOCK SENSOR POWER SUPPLY

Check voltage between Intelligent Key unit connector terminal 28 and ground.

VOLTAGE SPECIFICATION

Connector	Terminals		Condition	Voltage (V) (Approx.)
Connector	(+)	(-)	Condition	Voltage (V) (Approx.)
M42	28	Ground	Driver side door lock is locked	5
M42	28	Ground	Driver side door lock is unlocked	0

Fig 1: Checking Voltage Between Intelligent Key Unit Connector Terminal 28 And Ground

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

OK or NG

OK: front door lock assembly LH (door unlock sensor) is OK.

NG: GO TO 2.

CHECK UNLOCK SENSOR CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect Intelligent Key unit and front door lock assembly LH (door unlock sensor) connector.
3. Check continuity between Intelligent Key unit harness connector M42 (A) terminal 28 and front door lock assembly LH (door unlock sensor) harness connector D9 (B) terminal 3.
  28 - 3 : Continuity should exist.
4. Check continuity between Intelligent Key unit harness connector M42 (A) terminal 28 and ground.
  28 - Ground : Continuity should not exist.
  
  Fig 2: Checking Continuity Between Intelligent Key Unit Harness Connector M42 Terminal 28 And Ground
  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 LH (door unlock sensor).
CHECK UNLOCK SENSOR GROUND CIRCUIT
Check continuity between front door lock assembly LH (door unlock sensor) harness connector D9 terminal 4 and ground.

4 - Ground : Continuity should exist.

Fig 3: Checking Continuity Between Front Door Lock Assembly LH Harness Connector D9 Terminal 4 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 harness connector.
2. Check voltage between Intelligent Key unit harness connector M42 terminal 28 and ground.
  28 - Ground : Approx. 5V
  
  Fig 4: Checking Voltage Between Intelligent Key Unit Harness Connector M42 Terminal 28 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  OK or NG
  
  OK: Replace front door lock assembly LH (door unlock sensor).
  
  NG: Replace Intelligent Key unit. Refer to "REMOVAL AND INSTALLATION OF INTELLIGENT KEY UNIT ".