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Key Switch (Intelligent Key Unit Input) Check

  1. CHECK KEY SWITCH 

    With CONSULT-III 

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

    DATA MONITOR

    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 M42 terminal 7 and ground.
      CONNECTOR TERMINAL VOLTAGE SPECIFICATION

      Connector Terminals Condition Voltage (V) (Approx.)
      (+) (-)
      M42 7 Ground Insert mechanical key into ignition switch Battery voltage
      Remove mechanical key from ignition switch 0

    OK or NG 

    OK: Key switch is OK.

    NG: GO TO 2.

    Fig 1: Checking Voltage Between Intelligent Key Unit Harness Connector M42 Terminal 7 And Ground
    G04916801
  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 M49 terminal 2 and ground.

      2 - 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 2 And Ground
    G04927648
  3. CHECK KEY SWITCH OPERATION 

    Check continuity between key switch and ignition knob switch terminals 1 and 2.

    CONNECTOR TERMINAL CONTINUITY SPECIFICATION

    Component Terminals Condition Continuity
    Key switch 1 2 Insert mechanical key into ignition switch. Yes
    Remove mechanical key from ignition switch. No

    OK or NG 

    OK: GO TO 4.

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

    Fig 3: Checking Continuity Between Ignition Knob Switch Harness Connector M118 Terminal 1 And 2
    G04916811
  4. CHECK KEY SWITCH CIRCUIT 
    1. Check continuity between Intelligent Key unit harness connector M42 (A) terminal 7 and key switch and ignition knob switch harness connector M49 (B) terminal 1.

      7 - 1 : Continuity should exist. 

    2. Check continuity between Intelligent Key unit harness connector M42 (A) terminal 7 and ground.

      7 - 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 7 And Ground
    G04927650
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