Shift Interlock: Description and Operation

Interlock System

How the Circuit Works

Key Interlock
Voltage is supplied at all times to the key interlock switch through fuse 47 (in the under-hood fuse/relay box). When the ignition key is pushed into the ignition switch, battery voltage is provided to the key interlock solenoid. If the shift lever is in PARK, the park pin switch provides ground to the key interlock solenoid energizing the solenoid and allowing the key to be turned to the LOCK (0) position.

Shift Position Interlock
Battery voltage is supplied at all times through fuse 47 (in the under-hood fuse/relay box) to the brake pedal position switch. With the ignition switch in ACC (I) or ON (II), battery voltage is supplied through fuse 8 (in the driver's under-dash fuse/relay box) to the shift lock solenoid. When the brake pedal is pushed, battery voltage is applied through the WHT/BLK wire to the PCM. If, at the same time, the accelerator pedal is not pushed, ground is provided to the shift lock solenoid through the PCM. The solenoid is then energized allowing the shift lever to be moved from the PARK position.