Vehicle Theft Security System - Operation

OPERATION

The Instrument Cluster, referred to as the Cab Compartment Node (CCN), is used to control and integrate many of the functions and features included in the Vehicle Theft Security System (VTSS). In the VTSS, the CCN receives inputs indicating the status of the door ajar switches, the liftgate ajar switch and the ignition switch. The CCN processes the information from all of these inputs, internally controls the security indicator as appropriate, and sends electronic messages to the Integrated Power Module (IPM) over the Controller Area Network (CAN) data bus. The FCM internally controls the output to the hazard warning lamps and sends a control output to energize or de-energize the horn relay as appropriate.

The following are paragraphs describing the operation of each of the VTSS features.

ENABLING

VTSS should be learned of the vehicle configuration message from the FCM when the EMIC/CCN gets replaced.

ARMING

Passive arming of the VTSS occurs when the vehicle is exited with the key removed from the ignition switch, the headlamps turned off, and the doors are locked while they are open using the power door lock switch. Active arming occurs when the Lock button on the Remote Keyless Entry (RKE) transmitter is pressed to lock the vehicle. For active arming to occur, the doors must be closed and the ignition switch must be in the off position when the RKE transmitter Lock button is pressed. The power door lock switch will not function if the key is in the ignition switch or the headlamps are turned on with the driver side front door open.

Pre-arming of the VTSS is initiated when a door or the liftgate is open, when the vehicle is locked using a power door lock switch, or when the RKE transmitter Lock button is pressed. Pre-arming will not occur if the key is in the ignition switch or the headlamps are turned on with the driver side front door open. When the VTSS is pre-armed, the arming sequence is delayed until all of the doors and the liftgate have been closed. The VTSS will remains in the Pre-Armed mode for up to 16 seconds after all doors and the liftgate have been closed.

Once the VTSS begins the passive or active arming sequence, the security indicator in the instrument cluster will flashes rapidly for about 17seconds, indicating VTSS arming is in progress. If the ignition switch is turned to the ON position, a door or the liftgate opened, or unlocked by any means, or the RKE Panic button is pressed during the 16 second arming process, the security indicator stops flashing and the arming process aborts. Once the 16 second arming sequence is successfully completed, the security indicator flashes at a slower rate, indicating the VTSS is armed.

DISARMING

Active disarming of the VTSS occurs when the vehicle is unlocked by pressing the Unlock button of the RKE transmitter. Once the alarm has been activated, either disarming method deactivates the alarm. Pressing the Panic button on the RKE transmitter will not disarm the VTSS.

POWER-UP MODE

When the armed VTSS senses the battery has been disconnected and reconnected, it enters its power-up mode. In power-up mode the alarm system remains armed following a battery failure or disconnect. If the VTSS was armed prior to a battery disconnect or failure, the technician or vehicle operator has to actively or passively disarm the alarm system after the battery is reconnected. The power-up mode also applies if the battery goes dead while the system is armed, and battery jump-starting is attempted. The VTSS is armed until the technician or vehicle operator has actively or passively disarmed the alarm system. If the VTSS is in the disarmed mode prior to a battery disconnect or failure, it will remains disarmed after the battery is reconnected or replaced, or if jump-starting is attempted.

TAMPER ALERT

The VTSS tamper alert feature will sounds the horn three times upon disarming, if the alarm was triggered and has since timed-out (about 18 minutes) or if the battery has been disconnected and reconnected. This feature alerts the vehicle operator the VTSS alarm was activated while the vehicle was unattended.