tufluv82toy

1985 c4 all original 43k miles. Having a serious issue with a discharging battery. Battery is brand new and will discharge over night. I did a key off amps draw test and found about .80 amp. I started pulling fuses and the crtsy/clk fuse stops the draw. I then un plugged everything i can find on that circuit and still have the draw!!!!(all lights, door buttons etc etc) There is a black relay under the passenger side of the dash that when un plugged also stops the draw. What is this relay? it is fairly large. Any ideas what could be doing this? Also when the car is off and all doors are closed and keys are removed the security light will come on on the dash solid (no blinky) It doesn't matter whether or not the doors are locked or not it always comes on. Any help would be appreciated. Car starts and runs fine just cant park it for long or the battery discharges..... Thank you!

Hooked on Vettes

If the large relay looks similar to the picture below, it's the Theft Deterrent Forced Entry
Alarm module. If the module is bad, used ones are available on E-Bay.

The module controls the Security Light.

The Security Light should blink when the ignition is off and either door is open.

The module is probably bad if the Security light is staying on.

You can test the alarm module by doing the following.
I'm assuming you have power door locks.

Roll the windows down.
Open either door,
The Security light should be blinking.
Use the Power Door Lock switch to lock the doors.
The Security light should stay on solid.
Get out of the car and close the door.
After a couple of seconds the Security light should go out indicating the system
is armed.
Reach in and open the door either by using the power door lock button or manual
slide to open the door. When the door is opened, the horns should pulse.
To disarm the system, use the door lock key to open the door.