Check Unlock Sensor

WARNING: This page is about a different car, the 2006 Infiniti G35. 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 and ground.

TERMINALS VOLTAGE REFERENCE

Connector	Terminals (Wire color)		Condition	Voltage (V) (Approx.)
Connector	(+)	(-)	Condition	Voltage (V) (Approx.)
M75	28 (L)	Ground	Driver side door lock is locked	5
M75	28 (L)	Ground	Driver side door lock is unlocked	0

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

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

OK or NG

OK: Unlock sensor is OK.

NG: GO TO 2.

CHECK UNLOCK SENSOR CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect Intelligent Key unit and driver side door lock assembly (door unlock sensor) connector.
3. Check continuity between Intelligent Key unit harness connector M75 terminal 28 and driver side door lock assembly (door unlock sensor) harness connector D15 terminal 4.
  28 (L) - 4 (L): Continuity should exist .
4. Check continuity between Intelligent Key unit harness connector M75 terminal 28 and ground.
  28 (L) - Ground: Continuity should not exist .
  
  Fig 2: Identifying Continuity Between Intelligent Key Unit Connector M75 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 (driver side).
CHECK UNLOCK SENSOR GROUND CIRCUIT
Check continuity between driver side door lock assembly (door unlock sensor) harness connector D15 terminal 5 and ground.

5 (B) - Ground: Continuity should exist .

OK or NG

OK: GO TO 4.

NG: Repair or replace harness.

Fig 3: Identifying Continuity Between Driver Side Door Lock Assembly Connector D15 Terminal 5 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK INTELLIGENT KEY UNIT OUTPUT SIGNAL
1. Connect Intelligent Key unit harness connector.
2. Check voltage between Intelligent Key unit harness connector M75 terminal 28 and ground.
  28 (L) - Ground: Approx. 5V
OK or NG

OK: Replace driver side door lock assembly (door unlock sensor).

NG: Replace Intelligent Key unit.

Fig 4: Identifying Voltage Between Intelligent Key Unit Harness Connector M75 Terminal 28 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.