Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Shift Interlock Systems: Description
Transmission is equipped with an electronically controlled shift interlock system. Prizm incorporates an electronically controlled ignition key lock system. The Metro and Tracker ignition key lock system is cable operated. For adjustment procedures on Metro and Tracker, see ADJUSTMENTS in appropriate TRANSMISSION SERVICING - A/T article.
TRANSMISSION SERVICING - A/T - Metro & Firefly (Canadian)
TRANSMISSION SERVICING - A/T - Prizm
TRANSMISSION SERVICING - A/T - Tracker
Shift interlock system prevents gear selector lever from being moved from "P" position unless brake pedal is depressed. In case of a malfunction, shift lever can be released by depressing shift lock override button, located near shift lever. Ignition key lock system prevents ignition key from being moved from ON or ACC position to LOCK position unless gear selector lever is in "P" position.
System components include some or all of the following: stoplight switch, Park/Neutral Position (PNP) switch or Transmission Range (TR) switch, shift lock diode, shift lock relay, shift lock solenoid, ignition key lock solenoid, shift lock control switch, shift lock control module and shift lock override button. See WIRING DIAGRAMS for specific application.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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