Security System

The Security System consists of the following components:
Security control unit
Door switches
Left front, right front, and tailgate door key detect and tamper switches
Tailgate switch
Engine hood switch
Door lock actuators
Left and right front door lock switches
Lighting relay
Starter relay
Headlights
"ANTI-THEFT" indicator light
Security horn

The arming sequence begins with the ignition switch in the LOCK position and all doors closed. (All theft related switches are open to ground.) The "ANTI-THEFT" indicator then flashes for about 30 seconds or until the arming sequence is completed. The system will arm when the driver's door is locked with the door key, the door lock actuator internal switch will open, removing ground from the security control unit. Now all inputs to the security control unit are open to ground and the "ANTI-THEFT" indicator light stays on for about 8 seconds. The security system is now armed. If any of the theft related switches are grounded, the theft alarm is activated. The control unit keeps the vehicle from being started by not applying ground to the starter relay. The control unit intermittently connects the lighting relay to ground causing the headlights to flash. At the same time, it intermittently connects the security horn to ground, causing it to sound. The system alarm is cancelled when battery voltage is applied to the control unit's ignition input or ground is applied to its key detect input.