Help my wifes keyless remote has broken on our 99 sub. I have another one from a 99 tahoe exact same one, but how do you program it? Also will it effect my remote that I have?

Thanks

Here is what worked on my 2000 GMC Sierra. Remember you need to re-program all of the key fobs at the same time

http://mywebpages.comcast.net/00gmc/transmitters.htm

nope that will not work on an obs. on the computer diag port, jump pins 4 and 8. the door locks will lock and unlock. with your remotes, press lock and unlock on each of them. then remove your jumper.