FixVault
Home › Infiniti › 2006 › Q45 › Repair and Diagnosis › Body & Frame › Door Locks › Body, Lock & Security System › Power Door Lock System › Check Key Switch

Check Key Switch

  1. CHECK KEY SWITCH 

    With CONSULT-II 

    Check key switch "IGN KEY SW" in "DATA MONITOR" mode with CONSULT-II.

    Key is inserted in ignition key cylinder : IGN KEY SW ON 

    Key is removed from ignition key cylinder : IGN KEY SW OFF 

    Fig 1: CONSULT-II Display - Data Monitor
    G04129381Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    Check voltage between BCM connector and ground.

    CONNECTOR VOLTAGE CHART

    Connector Terminal (Wire color) Condition Voltage (V) (Approx.)
    (+) (-)
    M4 69 (PU/W) Ground Key is inserted Battery voltage
    Key is removed 0

    OK or NG 

    • OK : Key switch is OK.
    • NG : GO TO 2.
      Fig 2: Checking Voltage Between BCM Connector And Ground
      G04129382Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK KEY SWITCH CIRCUIT 
    1. Disconnect key switch connector.
    2. Check continuity between BCM connector M4 terminal 69 and key switch connector M64 terminal 4.

      69 (PU/W) - 4 (PU/W) : Continuity should exist. 

    3. Check continuity between BCM connector M4 terminal 69 and ground.

      69 (PU/W) - Ground : Continuity should not exist. 

    OK or NG 

    • OK : GO TO 3.
    • NG : Repair or replace harness.
      Fig 3: Checking Continuity Between BCM Connector M4 Terminal 69 And Ground
      G04129383Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK KEY SWITCH 

    Check continuity between key switch terminals 3 and 4.

    CONTINUITY CHART

    Connector Terminal Condition of key switch Continuity
    M64 3 4 Key is inserted in ignition key cylinder. Yes
    Key is removed from ignition key cylinder. No

    OK or NG 

    • OK : Check the following.
      • 10A fuse [No. 32, located in fuse block (J/B) No. 2]
      • Harness for open or short between key switch and fuse
    • NG : Replace key switch.
      Fig 4: Checking Continuity Between Key Switch Terminals 3 And 4
      G04129384Courtesy of NISSAN MOTOR CO., U.S.A.
About FixVault