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Key Switch and Ignition Knob Switch Signal Inspection (With Intelligent Key, When Mechanical Key Is Used)

WARNING: This page is about a different car, the 2007 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FUSE 

    Check if the key switch and ignition knob switch 10A fuse [No. 9, located in the fuse block (J/B)] is blown.

    OK or NG 

    OK: GO TO 2.

    NG: Be sure to repair the cause of malfunction before installing new fuse. Refer to "POWER SUPPLY ROUTING CIRCUIT ".

  2. CHECK BCM INPUT SIGNAL 

    With CONSULT-III 

    1. Select "BCM".
    2. With "DATA MONITOR" of "BUZZER", confirm "KEY ON SW" when the key is operated.

      "KEY ON SW" 

      When key is inserted into ignition key cylinder : ON 

      When key is removed from ignition key cylinder : OFF 

      Without CONSULT-III 

    Check voltage between BCM harness connector and ground.

    CONNECTOR TERMINAL VOLTAGE SPECIFICATION

    Terminals Condition Voltage (Approx.)
    (+) (-)
    BCM connector Terminal
    M18 37 Ground Key is inserted Battery voltage
    Key is removed 0

    OK or NG 

    OK: Key switch and ignition knob switch signal is OK. Return to "SYMPTOM CHART ".

    NG: GO TO 3.

    Fig 1: Checking Voltage Between BCM Harness Connector And Ground
    G04928459
  3. CHECK KEY SWITCH 
    1. Turn ignition switch OFF.
    2. Disconnect key switch and ignition knob switch connector.
    3. Check continuity between key switch and ignition knob switch terminals 1 and 2.
      CONNECTOR TERMINAL CONTINUITY SPECIFICATION

      Terminals Condition Continuity
      1 2 When key is inserted into ignition key cylinder Yes
      When key is removed from ignition key cylinder No

    OK or NG 

    OK: GO TO 4.

    NG: Replace key switch and ignition knob switch.

    Fig 2: Checking Continuity Between Key Switch And Key Lock Solenoid Terminals 1 And 2
    G04928464
  4. CHECK KEY SWITCH CIRCUIT 
    1. Disconnect BCM connector.
    2. Check continuity between BCM harness connector (A) and key switch and ignition knob switch harness connector (B).
      CONNECTOR TERMINAL CONTINUITY SPECIFICATION

      A B Continuity
      Connector Terminal Connector Terminal
      M18 37 M49 1 Yes
    3. Check continuity between BCM harness connector (A) and ground.
      CONNECTOR TERMINAL CONTINUITY SPECIFICATION

      A Ground Continuity
      Connector Terminal
      M18 37 No

    OK or NG 

    OK: GO TO 5.

    NG: Repair harness or connector.

    Fig 3: Checking Continuity Between BCM Harness Connector And Key Switch And Ignition Knob Switch Harness Connector
    G04928465
  5. CHECK KEY SWITCH POWER SUPPLY CIRCUIT 

    Check voltage between key switch and ignition knob switch harness connector and ground.

    CONNECTOR TERMINAL VOLTAGE SPECIFICATION

    Terminals Voltage (Approx.)
    (+) (-)
    Key switch and ignition knob switch connector Terminal
    M49 2 Ground Battery voltage

    OK or NG 

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

    NG: Repair harness or connector.

    Fig 4: Checking Voltage Between Key Switch And Ignition Knob Switch Harness Connector And Ground
    G04928466
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