Circuit Operation

INTRODUCTION
The Vehicle Theft Security System (VTSS) is passive system and is designed to protect against whole vehicle theft. The system monitors vehicle doors, trunk key cylinder, and ignition action for unauthorized operation.

The VTSS also deactivates the Universal Transmitter (garage door opener) and trunk lid release button when the vehicle is armed. The trunk lid can only be opened using the key or RKE transmitter when the VTSS is armed. When the vehicle is disarmed, the systems are restored to normal operation.
The VTSS alarm activates:
- Sounding of the horn
- Flashing of the interior lamps
- Flashing of the headlamps
- An engine kill feature

Passive arming occurs upon normal vehicle exit: Open door, lock with power locks, close door The Vehicle Theft security LED lamp in the instrument cluster will flash quickly for 15 Seconds, indicating that arming is in progress. If no monitored switches are activated during this period, the system will arm. After 15 Seconds the LED lamp will continue to flash but at a slower rate. This indicates that the system is armed. If the trunk key cylinder switch is not sensed by the system, the LED lamp will remain lit during the arming process, although the system will still arm.

The system is to be considered as an active armed system when using:
- The Remote Keyless Entry
- The Central Lock Feature.

If the LED lamp does not illuminate at all upon door closing it indicates that the system is not arming or the LED lamp is not operation. Refer to the System Self-Tests

Passive disarming occurs upon normal vehicle entry by unlocking either door with the ignition key/remote transmitter. This disarming will also halt the alarm once it has been activated.

A tamper alert exists to notify the driver that the alarm had been activated. If the alarm has since timed-out for at least 3 Minutes but not more than 18 Minutes the tamper alert will sound. If the trunk lid has been activated the tamper alert will sound till the VTSS is disarmed. The temper alert consists of 3 horn pulses when the vehicle is disarmed.

The alarm system will not arm if the doors are locked manually by pushing the lock knobs. This will manually override the system.

SYSTEM OPERATION
Central Lock/Unlock System
The central lock/unlock system uses the Vehicle Theft Security System door switch to lock and unlock all doors using the key. Turning the key to the lock position in the driver's or passenger s door will lock all doors. Turning the key in the driver's door to the unlock position once will unlock driver's door only. Turning the key a second time within five seconds of the first time will unlock all doors. Turning the key in the passenger's door to the unlock position will unlock all doors.
Using the door key cylinder or the RKE transmitter lock/unlock operation will arm/disarm the Vehicle Theft Security System.

Triggering The VTSS
Using the power door switch, ignition key or the keyless transmitter will arm the system. Any of the following actions will trigger the system:
1. Opening any door.
2. Removing the trunk lock cylinder.
3. Turning the ignition to the ON position.

NOTE: The ignition switch can be turned to the accessory position without triggering alarm system.

CIRCUIT OPERATION
Vehicle Theft Security System
The optional Vehicle Theft Security System (VTSS) is used to protect the vehicle from theft, by monitoring the vehicle doors, ignition switch, power door lock circuits, and the trunk key cylinder to determine if the horn should be sounded and the ignition system disabled.

The Body Control Module (BCM) is used as the control for the system. The inputs for the system are divided in two sections. The trunk area and the passenger compartment. If there is a malfunction in the trunk area switch the system will still ARM but the switch will not be monitored. If the switch becomes functional while the system is ARMED it will be used as an input to the BCM. A problem in any passenger compartment switch will not allow the system to ARM.

The VTSS system uses a Light Emitting Diode (LED) located in the instrument cluster to indicate when the system is ARMED. The LED is supplied power on circuit F33 at the instrument cluster. The BCM controls ground for the LED on circuit G69.