Electrical? BCM? Passlock? or Ghost???

1.    1999 PONTIAC GRAND AM 2. Engine size 2.4 L4 3. Transmission AUTOMATIC 4. Mileage 160000 5. Fuel Injection 6. ABS brakes 7. Cruise control CRUISE CONTROL, A/C, POWER STEERING

My 1999 Pontiac Grand Am SE 2dr 4cyl automatic transmission is messing up. When I open a door, bump in to it, turn it on or do anything that involves electricity the car lights start flashing and clicking and if I hadn't turned of my alarm horn it would beep sometimes. It will even start flashing when I come to a stop light, and the engine is still running. It does this every time!
My pass lock light on the dash is constantly FLASHING. This all started happening a few months ago when I let my friend drive the car and the battery just died, I replaced the battery is there anyway to stop the flashing and clicking? It is driving me crazy. I have to turn my headlights on during the day so people will not think I stole the car.
Is this my pass lock? I can start my car every time and the pass lock light is FLASHING not staying on constantly. Can I expect my car to stop starting any day? We tried to cut the yellow wire attached to the ignition but it didn't do any thing because I can start it every time so I doubt it is my ignition/ignition sensor. Please help I don't have the money or want to spend it on a dealer fixing it. I keep reading about installing a remote start to bypass the pass lock but my car STARTS. What do I do?
I tried to "re-learn" my car, nothing changed. I left it in the "on" position and the alarm light just kept blinking. I did the crank but don't start, leave on for 10 min, turn off for two min and repeated it 3 times and still no change.
Just yesterday it started doing something new... it will unlock itself at random...while I am driving when I'm parked and best yet I locked my car with the remote than when I came out of the store I lifted the door handle and it just unlocked itself! That will really keep a car thief from taking it!!
I have been searching the web for months on this problem but all I can find it problems with the passlock and ignition cylinder. The previous owner as a genius when he decided to install an after market alarm in the car when it already has a stock alarm. Could the two alarms be "fighting over control"?
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The place to start is checking the battery and all ground connections. Were the battery terminal connections cleaned good when the battery was replaced?

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its not pass lock prob..pass lock simply keeps bad guys from starting vehicle and driving off......................your last paragraph probably points at your prob....aftermarket alarm...it will probably take local guru's to de-snake your problem..........................kjun
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Be sure all connections on the alarm are solid too. One loose wire and . . . . . .
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