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.
Key Interlock System (All Models)
Key interlock system prevents ignition key from being removed from ignition lock assembly unless shift lever is in Park. When ignition key is in ignition lock assembly, key interlock switch closes, providing voltage to key interlock solenoid and interlock control unit.
If shift lever is not in Park (parking pin switch on), interlock control unit energizes key interlock solenoid by completing ground circuit. When key interlock solenoid is energized, ignition key cannot be removed from ignition lock assembly. Key interlock switch and key interlock solenoid are located on ignition lock assembly. See Fig 1 . Parking pin switch is located on bottom of shift lever. Interlock control unit is located behind left side of dash, near steering column.
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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.