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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis >> External Pages >> Different car >> Section 1748 (Body, Lock & Security System (Sedan)) >> Intelligent Key System >> Check Unlock Sensor
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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.
  1. 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.)
    (+) (-)
    M75 28 (L) Ground Driver side door lock is locked 5
    Driver side door lock is unlocked 0
    Fig 1: Identifying Voltage Between Intelligent Key Unit Connector And Ground
    G04122438Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: Unlock sensor is OK.
    • NG: GO TO 2.
  2. CHECK UNLOCK SENSOR CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect Intelligent Key unit and front door lock assembly (driver side) connector.
    3. Check continuity between Intelligent Key unit harness connector M75 terminal 28 and front door lock assembly (driver side) harness connector D11 terminal 2.

      28 (L) - 2 (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 Harness Connector M75 Terminal 28 And Ground
      G04122439Courtesy 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).
  3. CHECK UNLOCK SENSOR GROUND CIRCUIT 

    Check continuity between front door lock assembly (driver side) harness connector D11 terminal 4 and ground.

    4 (B) - Ground : Continuity should exist. 

    Fig 3: Identifying Continuity Between Front Door Lock Assembly Connector D11 Terminal 4 And Ground
    G04122440Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 4.
    • NG: Repair or replace harness.
  4. 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 

      Fig 4: Identifying Voltage Between Intelligent Key Unit Harness Connector M75 Terminal 28 And Ground
      G04122441Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: Replace front door lock assembly (driver side).
    • NG: Replace Intelligent Key unit.
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