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Back Door Key Cylinder Switch Check

WARNING: This page is about a different car, the 2006 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK BACK DOOR KEY CYLINDER SWITCH 

    With CONSULT-II

    Check back door 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 back door key cylinder is turned to LOCK:

      KEY CYL LK-SW: ON 

    • When key inserted in back door key cylinder is turned to UNLOCK:

    KEY CYL UN-SW: ON 

    Fig 1: CONSULT II Display - Data Monitor
    G04150922Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II

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

    TERMINALS CONDITION CONTINUITY CHART

    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 And Ground
    G04205444Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Back door key cylinder switch signal is OK.

    NG: GO TO 2.

  2. CHECK BACK DOOR KEY CYLINDER SWITCH 
    1. Turn ignition switch OFF.
    2. Disconnect back door key cylinder switch.
    3. Check continuity between back door key cylinder switch terminals 1, 2 and 3.
    TERMINALS CONDITION CONTINUITY CHART

    Terminals Condition Continuity
    1 - 2 Key is turned to LOCK. Yes
    Key is in N position or turned to UNLOCK No
    3 - 2 Key is turned to UNLOCK. Yes
    Key is in N position or turned to LOCK No
    Fig 3: Checking Continuity Between Back Door Key Cylinder Switch Terminals
    G04205445Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 3.

    NG: Replace back door key cylinder switch.

  3. CHECK BACK DOOR KEY CYLINDER SWITCH HARNESS 
    1. Disconnect BCM.
    2. Check continuity between BCM connector M18 terminals 7, 8 and back door key cylinder switch connector D505 terminals 3, 1.

      7 - 3: Continuity should exist  .

      8 - 1: 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 M18 Terminals And Back Door Key Cylinder Switch
    G04205446Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 4.

    NG: Repair or replace harness.

  4. CHECK BACK DOOR KEY CYLINDER SWITCH GROUND 

    Check continuity between back door key cylinder switch connector D505 terminal 2 and ground.

    2 - Ground: Continuity should exist  .

    Fig 5: Checking Continuity Between Back Door Key Cylinder Switch Connector D505 Terminal And Ground
    G04205447Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 5.

    NG: Repair or replace harness.

  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 

      Fig 6: Checking Voltage Between BCM Connector M18 Terminals 7, 8 And Ground
      G04205448Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK: Check condition of the harness and connector.

      NG: Replace BCM. Refer to "REMOVAL AND INSTALLATION OF BCM ".

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