Key Interlock

Battery voltage is supplied at all times through fuse 42 to the key interlock switch. When you put the key in the ignition switch, battery voltage is applied to the key interlock solenoid and to the key interlock circuit in the interlock control unit. When the A/T gear position switch is in PARK, ground is provided to the key interlock circuit. The interlock circuit then removes ground from the solenoid, de-energizing it. You can then remove the key from the ignition.