Sentry Key Remote Entry System (SKREES)

The Sentry Key Remote Entry System (SKREES), sometimes referred to as the Sentry Key Immobilizer System (SKIS), authenticates an electronically coded Transponder Key placed into the ignition and sends a valid/invalid key message to the Powertrain Control Module (PCM) based upon the results. The "VALID/INVALID KEY" message communication is performed using a rolling code algorithm via the Programmable Controller Area Network (CAN) data bus. A "VALID KEY" message must be sent to the Powertrain Control Module (PCM) within two seconds of ignition ON to free the engine from immobilization.