I know this is a long shot, but I have searched and googled everything I could and still cant find a solution. I have a Astra 777 alarm that came with the car (98 sedan 4cyl) when I bought it. I bought another remote for it since I only had one. I downloaded the manual online to program it. I went through all the steps with both remotes and according to manual they both sounded like they programmed fine. I go to try and lock the car with the new remote and it didn't work, so I tried the old remote (which did work) and that one didn't work either. I also tried reprogramming just the old remote and that didn't work. They both have good batteries. Any have any idea what else I can do? I'm beginning to think I wont get it to work.

 

it's possible the firmware on the alarm brain is not compatible with the latest firmware you downloaded for the remotes.

maybe look for a remote program that is old, as old as the actual unit.

 

But the old remote worked just fine before I tried to program the new one.

 

you said you reprogrammed the existing remote when you programmed the new one. the new program may be newer than the main unit and thus not compatible. or you missed a step in the programming process.

refer to this thread
Astra 777 reprogram LCD?