Sentry Key Immobilizer Module Bulb Check

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