Sentry Key Immobilizer System

Sentry Key Immobilizer System (SKIS) uses an ignition switch mounted receiver and special ignition keys with built in transponders. See Figure . Ignition key transponder sends signals to Sentry Key Immobilizer Module (SKIM). SKIM sends signals to the Body Control Module (BCM) to verify if key is a properly programmed key. BCM then sends a signal to PCM to disable or enable fuel delivery. If improper signals are sent to SKIM or wrong key is used to try to start vehicle, vehicle will fail to start until properly programmed key is used.