Front Door Lock Actuator LH (Door Unlock Sensor) Check

WARNING: This page is about a different car, the 2007 Nissan Maxima. 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.

FRONT DOOR LOCK ACTUATOR LH (DOOR UNLOCK SENSOR) CHECK

Connector	Terminals		Condition	Voltage (V) (Approx.)
Connector	(+)	(-)	Condition	Voltage (V) (Approx.)
M52	28	Ground	Driver side door lock is locked	5
M52	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 actuator 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 actuator LH (door unlock sensor) connector.
3. Check continuity between Intelligent Key unit harness connector (A) M52 terminal 28 and front door lock actuator LH (door unlock sensor) harness connector (B) D51 terminal 4.
  28 - 4: Continuity should exist.
4. Check continuity between Intelligent Key unit harness connector (A) M52 terminal 28 and ground.
  28 - Ground: Continuity should not exist.
Fig 2: Checking Continuity Between Intelligent Key Unit Harness Connector (A) M52 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 actuator LH (door unlock sensor).
CHECK UNLOCK SENSOR GROUND CIRCUIT
Check continuity between front door lock actuator LH (door unlock sensor) harness connector D51 terminal 5 and ground.

5 - Ground: Continuity should exist.

Fig 3: Checking Continuity Between Front Door Lock Actuator 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 harness connector.
2. Check voltage between Intelligent Key unit harness connector M52 terminal 28 and around.
  28 - Ground: Approx. 5V
Fig 4: Checking Voltage Between Intelligent Key Unit Harness Connector M52 Terminal 28 And Around
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: Replace front door lock actuator LH (door unlock sensor).

NG: Replace Intelligent Key unit. Refer to "REMOVAL AND INSTALLATION OF INTELLIGENT KEY UNIT ".