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.
Sentry Key Immobilizer Module (Skim) Bulb Check
Note operation of Vehicle Theft Security System (VTSS) LED located on top of instrument panel during check. Turn ignition on. SKIM should send message to BCM to turn VTSS LED on for about 3 seconds. After 3-second bulb check, SKIM sends message to turn VTSS LED off for about one second. If VTSS LED comes on and stays on after one second off period, there is a malfunction in the Sentry Key Immobilizer System (SKIS). If VTSS LED flashes and a single chime tone is heard, an invalid key was used to attempt vehicle start-up.
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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