My Astro came with two remotes and I believe one isn't programmed (already checked the battery) Does anyone know the procedure for programming the remote. You can email me direct at gtx1040@yahoo.com.....Thanks

If you don't mind experimenting go to the buick lesabre forum on this site and use the lesabre programing for the 1997-2000 (which is the same for the earlier) I tried it on my olds 88 - 1996 model and it worked. My guess it is the same.

A 2003 astro RKE reprograming looks to be simple,
standing next to vehicle, press and hold the lock & unlock together & hold for 5 seconds. Horn should chirp to confirm program. If you pop the back cover
of the transmitter it should say the same.