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. When you push the key into the ignition switch, battery voltage is provided to the key interlock solenoid. If the A/T shift lever is in PARK, the park pin switch provides ground to the key interlock solenoid, energizing the solenoid and allowing the key be turned to the LOCK (0) position.

Shift Position Interlock
Battery voltage is supplied at all times through fuse 47 to the brake pedal position switch. With the ignition in ON (II) or START (III), battery voltage is supplied through fuse 8 (in the driver's under-dash fuse/relay box) to the shift lock solenoid. When you push the brake pedal, battery voltage is applied through the WHT/BLK wire to the PCM. If, at the same time, you do not push the accelerator pedal, a low voltage signal is sent through the RED/BLK wire to the PCM. The PCM then applies voltage through the WHT/RED wire to the shift lock solenoid. If the shift lever is in the PARK position, the circuit provides ground to the shift lock solenoid. The solenoid is then energized allowing the shift lever to be moved from the PARK position.