Key Switch (Intelligent Key Unit Input) Check

With CONSULT 

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

Without CONSULT 

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

   Fig 1: Checking Key Switch

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   OK or NG 

   OK: Key switch is OK.

   NG: GO TO 2.

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 

   Fig 2: Checking Key Switch Power Supply Circuit

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   OK or NG 

   OK: GO TO 3.

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

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

Fig 3: Checking Key Switch Operation

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OK or NG 

OK: GO TO 4.

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

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  .

   Fig 4: Checking Key Switch Circuit

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   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.