Anti-Theft Systems: Description

Anti-theft system is an optional feature. System is called Sentry Key Immobilizer System (SKIS). System features a Sentry Key Immobilizer Module (SKIM), which is designed to provide passive protection from unauthorized entry by preventing engine from starting when system is armed. Other components include a warning indicator, transponder and Powertrain Control Module (PCM).

SKIM is installed on steering column, near ignition switch. A transponder is located under molded rubber cap of ignition key head. SKIM warning indicator is located in instrument cluster. SKIS performs a self-test each time ignition switch is turned to ON position. If a system malfunction is detected, a Diagnostic Trouble Code (DTC) will be stored. SKIS can be diagnosed and DTC's retrieved using Chrysler DRB III(R) scan tool.

SKIM module contains a Radio Frequency (RF) transceiver and a central processing unit, which contains SKIS programming logic. SKIS logic allows for communication over Chrysler Collision Detection (CCD) data bus network with PCM, instrument cluster and DRB scan tool. SKIM transmits and receives RF signals through a tuned antenna enclosed within a molded plastic ring that is part of the SKIM housing.

SKIM is also programmed with a unique "secret key" code and a security code. SKIM keeps secret code in memory and sends code over CCD data bus to PCM, which also stores code in memory. SKIM also sends code to each of "smart key" transponders. SKIM also stores Vehicle Identification Number (VIN).