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Key Switch (Intelligent Key Unit Input) Check: Notes

WARNING: This page is about a different car, the 2008 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK KEY SWITCH 

    With CONSULT-III 

    Check key switch ("KEY SW") in "DATA MONITOR" mode with CONSULT-III.

    KEY SWITCH (INTELLIGENT KEY UNIT INPUT) CHECK

    Monitor item Condition
    KEY SW Insert mechanical key into ignition switch: ON
    Remove mechanical key from ignition switch: OFF

    Without CONSULT-III 

    1. Turn ignition switch OFF.
    2. Disconnect Intelligent Key unit harness connector.
    3. Check voltage between Intelligent Key unit harness connector M52 terminal 7 and ground.
      INTELLIGENT KEY UNIT HARNESS CONNECTOR M52 TERMINAL 7 AND GROUND

      Connector Terminals Condition Voltage (V) (Approx.)
      (+) (-)
      M52 7 Ground Insert mechanical key into ignition switch Battery voltage
      Remove mechanical key from ignition switch 0
      Fig 1: Checking Voltage Between Intelligent Key Unit Harness Connector M52 Terminal 7 And Ground
      G04916801Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Key switch is OK.

    NG: GO TO 2.

  2. CHECK KEY SWITCH POWER SUPPLY CIRCUIT 
    1. Remove mechanical key from ignition switch.
    2. Disconnect key switch and ignition knob switch connector.
    3. Check voltage between key switch and ignition knob switch harness connector M73 terminal 3 and ground.

      3 - Ground: Battery voltage 

    Fig 2: Checking Voltage Between Key Switch And Ignition Knob Switch Connector M118 Terminal 3 And Ground
    G04916802Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 3.

    NG: Repair or replace key switch and ignition knob switch power supply circuit.

  3. CHECK KEY SWITCH OPERATION 

    Check continuity between key switch and ignition knob switch terminals 3 and 4.

    KEY SWITCH AND IGNITION KNOB SWITCH TERMINALS 3 AND 4

    Component Terminals Condition Continuity
    Key switch 3 4 Insert mechanical key into ignition switch. Yes
    Remove mechanical key from ignition switch. No
    Fig 3: Checking Continuity Between Key Switch And Ignition Knob Switch Connector M118 Terminals 3 And 4
    G04916738Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 4.

    NG: Replace key cylinder assembly (built-in key switch).

  4. CHECK KEY SWITCH CIRCUIT 
    1. Check continuity between Intelligent Key unit harness connector (A) M52 terminal 7 and key switch and ignition knob switch harness connector (B) M73 terminal 4.

      7 - 4: Continuity should exist. 

    2. Check continuity between Intelligent Key unit harness connector (A) M52 terminal 7 and ground.

      7 - Ground: Continuity should not exist. 

    Fig 4: Checking Continuity Between Intelligent Key Unit Harness Connector (A) M52 Terminal 7 And Ground
    G04916804Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Check the condition of harness and harness connector.

    NG: Repair or replace harness between Intelligent Key unit and key switch and ignition knob switch.

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