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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R Spec V >> Repair and Diagnosis >> External Pages >> Different car >> Section 1530 (Body, Lock & Security System) >> Power Door Lock System >> Front Door Lock Assembly LH (Key Cylinder Switch) Check
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Front Door Lock Assembly LH (Key Cylinder Switch) Check

WARNING: This page is about a different car, the 2005 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DOOR KEY CYLINDER SWITCH LH 

    With CONSULT-II

    Check front door lock assembly LH (key cylinder switch) ("KEY CYL LK-SW") and ("KEY CYL UN-SW) in DATA MONITOR mode in CONSULT-II. Refer to "DATA MONITOR ".

    • When key inserted in front key cylinder is turned to LOCK:

      KEY CYL LK-SW: ON 

    • When key inserted in front key cylinder is turned to UNLOCK:

      KEY CYL UN-SW: ON 

      Fig 1: CONSULT-II Display - Data Monitor Mode
      G03609384Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II

    Check voltage between BCM connector M18 terminals 7, 8 and ground.

    BCM CONNECTOR TERMINALS AND VOLTAGE REFERENCE

    Connector Terminals Condition Voltage (V) (Approx.)
    (+) (-)
    M18 7 Ground Neutral/Lock 5
    Unlock 0
    8 Neutral/Unlock 5
    Lock 0
    Fig 2: Checking Voltage Between BCM Connector M18 Terminals 7, 8 And Ground
    G03609385Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK: Front door lock assembly LH (key cylinder switch) signal is OK.
    • NG: GO TO 2.
  2. CHECK FRONT DOOR LOCK ASSEMBLY LH (KEY CYLINDER SWITCH) 
    1. Turn ignition switch OFF.
    2. Disconnect front door lock assembly LH (key cylinder switch).
    3. Check continuity between front door lock assembly LH (key cylinder switch) connector terminals 3, 4 and 5.
      BCM CONNECTOR TERMINALS AND CONTINUITY REFERENCE

      Terminals Condition Continuity
      4 - 5 Key is turned to LOCK. Yes
      Key is in N position or turned to UNLOCK No
      3 - 4 Key is turned to UNLOCK. Yes
      Key is in N position or turned to LOCK No
      Fig 3: Checking Continuity Between Front Door Lock Assembly LH (Key Cylinder Switch) Connector Terminals 3, 4 And 5
      G03609386Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

  3. CHECK FRONT DOOR LOCK ASSEMBLY LH HARNESS 
    1. Disconnect BCM.
    2. Check continuity between BCM connector M18 terminals 7, 8 and front door lock assembly LH connector D14 terminals 3, 5.

      7 - 3: Continuity should exist. 

      8 - 5: Continuity should exist. 

    3. Check continuity between BCM connector M18 terminals 7, 8 and ground.

      7 - Ground: Continuity should not exist. 

      8 - Ground: Continuity should not exist. 

    OK or NG 

    • OK: GO TO 4.
    • NG: Repair or replace harness
      Fig 4: Checking Continuity Between BCM Connector M18 Terminals 7, 8 And Ground
      G03609387Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK FRONT DOOR LOCK ASSEMBLY LH GROUND 

    Check continuity between front door lock assembly LH connector D14 terminal 4 and ground.

    4 - Ground: Continuity should exist. 

    OK or NG 

    • OK: GO TO 5.
    • NG: Repair or replace harness
      Fig 5: Checking Continuity Between Front Door Lock Assembly LH Connector D14 Terminal 4 And Ground
      G03609388Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK BCM OUTPUT VOLTAGE 
    1. Connect BCM.
    2. Check voltage between BCM connector M18 terminals 7, 8 and ground.

      7 - Ground: Approx. 5V 

      8 - Ground: Approx. 5V 

    OK or NG 

    • OK: Check condition of the harness and connector.
    • NG: Replace BCM. Refer to "REMOVAL AND INSTALLATION OF BCM ".
      Fig 6: Checking Voltage Between BCM Connector M18 Terminals 7, 8 And Ground
      G03609389Courtesy of NISSAN MOTOR CO., U.S.A.
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