Car Alarms: 2000 Jimmy Alarm, gmc jimmy, spark 2

Question
Hi! I do not know what to do anymore. The alarms keep going off. I drive a 2000 GMC Jimmy. I go to park my car,take the keys out, open the car door,locking it and all the alarms consistently go off. I go back into my car put the keys back in the ignition and of course it will not start because of the alarms still on. I jiggle the keys back and forth and at one point the alarms stop. Then I go open the car door, lock it and the alarms go off again. There is nothing in it's manual of how to stop this from happening all the time. Can you hep me? Thank you.

Answer
Please be more descriptive if possible.

"GOING OFF?"

I need to determine whether it's a factory alarm
issue or, if it's an aftermarket system you are
dealing with.

Ok let's clear up the terminology glitch here.

1. FACTORY/OEM alarm = Part of the original schematics
and plans from the manufacturer.
(horn honk, head lights flash, Starter may crank and
die, no spark)

2. DEALER INSTALLED alarm = Just that. Once the vehicle
is brought to a dealer, the dealer sub contracts the after market
security out.
(horn might honk, siren and parking lights flash, starter kill relya,
no start, no crank, just dead.)

3. AFTER MARKET alarm: Same as #2 but Customer IS AWARE that
the system was put in at the dealership, but may not
be informed of the brand name, or even what it's
total capabilities are.
(siren & parking lights flash, starter kill)

Which one applies to yours?

RM/ALARMTEK
CARALARMMAN.COM