LEMON Manuals: Even more car manuals for everyone
Home >> Nissan-Datsun >> 2003 >> Sentra SE-R Spec V >> Repair and Diagnosis >> External Pages >> Different car >> Section 1620 (Body, Lock & Security System) >> Vehicle Security (Theft Warning) System >> Diagnostic Procedure 3

Diagnostic Procedure 3

WARNING: This page is about a different car, the 2005 Nissan Frontier. 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
      G03596515Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II

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

    BCM CONNECTOR TERMINALS 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
    G03596516Courtesy 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.
      FRONT DOOR LOCK ASSEMBLY CONNECTOR TERMINALS 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

    OK or NG 

    • OK: GO TO 3.
    • NG: Replace front door lock assembly LH (key cylinder switch). Refer to "REMOVAL AND INSTALLATION ".
      Fig 3: Checking Continuity Between Front Door Lock Assembly Connector Terminals 3, 4 And 5
      G03596517Courtesy of NISSAN MOTOR CO., U.S.A.
  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. 

      Fig 4: Checking Continuity Between BCM Connector Terminals 7, 8 And Front Door Lock Assembly Connector Terminals 3, 5
      G03596518Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK: GO TO 4.
    • NG: Repair or replace harness
  4. CHECK FRONT DOOR LOCK ASSEMBLY LH GROUND 

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

    OK or NG 

    • OK: GO TO 5.
    • NG: Repair or replace harness
      Fig 5: Checking Continuity Between Front Door Lock Assembly Connector D14 Terminal 4 And Ground
      G03596519Courtesy 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
      G03596520Courtesy of NISSAN MOTOR CO., U.S.A.
scientia non olet · About LEMON Manuals