Compustar what really happen to it.

well i got this alarm installed in my 92 honda civic hatchback and when i got it done i was happy. its started my manual car up and it also made my ac work too with out my key in the car. but one day it just stop working like that.Ex like i would start the car with the remote and the ac would work like its supposed too. but one day i started the car and the ac didnt work anymore like that. when i put the key in and turn it like i supposed to the ac work fine but doesnt work like it use to without the key turn on.. well i took it back to the shop where i got it installed at and they said that that relays on the brain went out and that the cpu needs to be replaced.. i dont know cause they kinda seem like they wanted to make more money selling me a new alarm again instead of fixing my old one.so is it my cpu or one of the relays and if its the relays how can i fix it?? well one day i gave up and wanted to go get it fixed and when i went back to the shop who i had it install it and didnt buy it from they were not there any more(went out of buessness)so what do i do now i cant send it back to compustar cause they wont send me a new one (i dont think they will) and i wanna have my alarm wokring to it full

Since the car starts OK, I don't think there's a problem with the CPU. I would change the relay to see what happens. What's the model number of the compustar system?