Sentry Key Immobilizer System (Skis)
WARNING: This page is about a different car, the 2002 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
The Sentry Key Immobilizer System (SKIS) is an immobilizer system designed to prevent unauthorized vehicle operation. The system consists of a Sentry Key Immobilizer Module (SKIM), ignition key(s) equipped with a transponder chip and engine controller. When the ignition switch is turned on, the SKIM interrogates the ignition key. If the ignition key is Valid the SKIM sends a PCI Bus message to the engine controller indicating the presence of a valid ignition key. Upon receiving a Valid key signal the PCM/ECM will allow the engine to continue to operate. For additional information on the SKIS, see to ANTI-THEFT SYSTEMS - GRAND CHEROKEE article.