RE: Alarm Problems
From the manual...
Triggering the System
Opening any door without disarming the system triggers the alarm (lamps and horn) for three minutes, even if the door closes. After three minutes, the lamps and horn will turn off and the Module will return to an armed state. Also, the Starting System is disabled and will remain disabled until the system is disarmed.
Once the system is armed, opening any door causes a ground signal through the 627 (BK/O) wire to trigger the alarm circuits in the Module. The Module then provides a pulsating ground signal to the Alarm Indicator through the 343 (DB/LG) wire and to the Horn Relay coil through the 6 (Y/LG) wire. Pulsating battery voltage is applied to the Lo Beam Headlamps and the Parking Lamps through the 218 (W/P) wire.
At the same time, the Module prevents current from energizing the Starter Relay by means of an open circuit between wires 23 (T/LG) and 32 (R/LB) and the car cannot be started.
An Anti-theft Trunk Lid Switch is also included in the system. If an attempt is made to remove the trunk lock (punch out, etc.), the switch closes and a ground signal is applied to the Module through the 26 (W/P) wire. This triggers the system in the same manner as previously described for opening a door. The trunk key can be used to open the trunk without triggering the system.
An Anti-theft Hood Switch is also part of the system. If the hood is forced open while the system is armed, the switch closes and a ground signal is applied to the module through the 26 (W/P) wire. This triggers the system in the same manner as the Anti-theft Trunk Lid Switch.
The Ignition Switch has a built in Anti-theft Switch. If an attempt is made to remove the Ignition Cylinder, the switch closes and a ground is applied to the module through the 936 (DG/W) wire. This triggers the system in the same manner as previously decided for opening a door.
As you can see, a malfunction in any door switch, trunk switch, hood switch or ignition switch sends a ground signal to the module triggering the system. Unplugging any sensor/switch actually creates an open circuit preventing a ground signal from that switch. No ground signal, no alarm. It's a process of elimination.