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)
SKIM prevents unauthorized vehicle operation. Sentry Key Immobilizer System (SKIS) consists of the SKIM and ignition keys equipped with a transponder chip (Sentry Keys). SKIM communicates with other modules via the Programmable Communication Interface (PCI) bus circuit.
SKIM sends messages to Mechanical Instrument Cluster (MIC) module to control Vehicle Theft Security System (VTSS) indicator light. MIC module performs VTSS indicator light check when ignition switch is turned to RUN or START position. MIC turns indicator light on for about 3 seconds. If indicator light remains on, SKIM has determined a system malfunction exists or SKIS has become inoperative. If invalid key is inserted in ignition switch and turned to RUN position, SKIM will flash VTSS light. If invalid key is turned to START position, vehicle will start and run for 2 seconds, then shut off. For additional information on SKIS, see SELF-DIAGNOSTICS - NEON article.
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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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