Shift Interlock System

The shift interlock system consists of:

• a shift lock actuator.
  • A transmission shift selector position insert, which bolts to the steering column and secures the shift lock actuator.
  • A contained PARK indicator switch.
• electrical circuits to supply power to unlock the shift lock actuator.

The shift lock actuator locks the gearshift lever in PARK:

• when the ignition switch lock cylinder is in the LOCK position.
• with the ignition switch lock cylinder in the RUN position and the brake pedal released.

The shift lock actuator releases the gearshift lever:

• with the ignition switch lock cylinder in the RUN position and the brake pedal actuated.

Transmission Control (TC) Switch 

The TC switch:

• is located on the end of the gearshift lever.
  • The TC switch is not removable from the gearshift lever. Install a new gearshift lever if a new TC switch is required.
• is a momentary contact switch.
• commands the powertrain control module (PCM) to disengage or engage the overdrive function of the transmission.
  • When overdrive (D) is disengaged, the message O/D OFF will illuminate on the instrument panel.