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Ignition Knob Switch Check

  1. CHECK IGNITION KNOB SWITCH 

    With CONSULT-III 

    Display "PUSH SW" on DATA MONITOR screen, and check if ON/OFF display is linked to ignition switch operation.

    DATA MONITOR

    Monitor item Condition
    PUSH SW Ignition switch is pushed: ON
    Ignition switch is released: OFF

    Without CONSULT-III 

    1. Turn ignition switch OFF.
    2. Disconnect Intelligent Key unit connector.
    3. Check voltage between Intelligent Key unit harness connector M42 terminal 27 and ground.
      CONNECTOR TERMINAL VOLTAGE SPECIFICATION

      Connector Terminals Condition Voltage (V) (Approx.)
      (+) (-)
      M42 27 Ground Ignition switch is pushed Battery voltage
      Ignition switch is released 0
      Fig 1: Checking Voltage Between Intelligent Key Unit Harness Connector M42 Terminal 27 And Ground
      G04916809

    OK or NG 

    OK: Ignition knob switch is OK.

    NG: GO TO 2.

  2. CHECK IGNITION KNOB SWITCH POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect key switch and ignition knob switch connector.
    3. Check voltage between key switch and ignition knob switch harness connector M49 terminal 4 and ground.

      4 - Ground : Battery voltage 

    OK or NG 

    OK: GO TO 3.

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

    Fig 2: Checking Voltage Between Key Switch And Ignition Knob Switch Harness Connector M49 Terminal 4 And Ground
    G04927655
  3. CHECK IGNITION KNOB SWITCH OPERATION 

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

    CONNECTOR TERMINAL CONTINUITY SPECIFICATION

    Component Terminals Condition Continuity
    Ignition knob switch 3 4 Ignition switch is pushed Yes
    Ignition switch is released No

    OK or NG 

    OK: GO TO 4.

    NG: Replace key switch and ignition knob switch.

    Fig 3: Checking Continuity Between Key Switch And Ignition Knob Switch Terminals 3 And 4
    G04927656
  4. CHECK IGNITION KNOB SWITCH CIRCUIT 
    1. Check continuity between Intelligent Key unit harness connector M42 (A) terminal 27 and key switch and ignition knob switch harness connector M49 (B) terminal 3.

      27 - 3 : Continuity should exist. 

    2. Check continuity between Intelligent Key unit harness connector M42 terminal 27 and ground.

      27 - Ground : Continuity should not exist. 

    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.

    Fig 4: Checking Continuity Between Intelligent Key Unit Harness Connector M42 Terminal 27 And Ground
    G04927657
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