2001 silverado with viper 791xv issues

I have a 2001 silverado ext cab. I had a viper 791xv alarm and remote start installed over 4 years ago. the alarm worked fine until about 2 weeks ago. all of a sudden i started to nitice a couple of things that didnt happen before. now when i arm and disarm the alarm from my controller the lights on my truck do not flash. the siren still makes the beeping noise when armed or unarmed but the brakes and marker lights no longer flash (the used to). second the alarm every once in a while triggers my check engine light on, i got a obdII reader and it gives me the "Password Incorrect" code. i clear the code and within a day or 2 is comes back on. Third, the trycks remote start system works when it wants to. sometimes it does and sometimes is doesnt. I tried going to the stereo and alarm place that installed it for me but they "TANKED" (went out of buisness) almost a year ago. i emailed DEI and they said to take it to another authorized dealer to have a look at it. I called a couple of other alarm places and they want between $75-$150 just to look at it. Does anyone know what the heck is going on? is it a fuse? a bad alarm brain? is there anything i can do to fix it? any help or answers is deeply apreciated. oh and one more thing, the trucks runs fineeven with the alarm acting all wierd. thanxsenorbob999

Sounds like a fuse for the lights that don't blink anymore, Are you sure it's the alarm that causes the check engine code? I think you better pay the asking fee of the shop to have it checked professionally!

Sounds like your alarm is no longer or never was connected to second ignition. I'd get this looked at ASAP or you could run into tranny problems. (gotta love GM's) Don't use the remote start until this gets fixed! For the parking light issue check the fuse from the alarm first. If that's not the problem, leave it for a tech.

when you say "must be hooked up to a powered wire" do you mean 12 volt constant or 12 switchable? i have a pretty good knowlege of car electronics. i checked the fuses and like you said the white wire's fuse was blown and now my lights blink when i arm and disarm my alarm. thanx for your help.senorbob999

Twelve volts powered as a second ignition!