alarm sets off - is that my fault ??

I've got some problems with my Buick.It's remote entry system doesn't work at all, I thought that I have to match tranismitter to car again (I bought this car last week). I checked in owners manual how to do that and I've found the information that I have to connect two pins in the diagnostic port(ALDL Connector) above accelerator pedal. I've done it but I've connected wrong pins. I left my car at parking side. Next evening man who works there told me that alarm had set off about 3 times during the night. I've disarmed the alarm (my tranismitter doesn't work at all, I close the door manually because I don't want to arm the security system). Today I've decided to check the alarm again. I've closed the door with the PDL button, after 2-3 houres alarm's set off without any reason. What's wrong?Is that my fault (wrong connected pins?)?I don't know what to do now. Is it anything serious?Remote entry still doesn't work at all. In addition to this when I've started the engine today Security lamp was on for 30 - 50 seconds. Everything was normal except this lamp.

Regards. Please help me!