1999 GMC Denali. I'm trying to program a new key fob. Everyone seems to agree that I should ground pin 4 to pin 8 on the Data Link Port to go into programming mode. Mine doesn't have a usable pin in slot 8. The "hold the unlock while on-off-on-off with the key" process also doesn't seem to work either. Any thoughts?
I have not. There have been several "key on, off, lock, hold this, hold that, dance, key on, push play on the CD, versions of solutions on the web (joking of course but sometimes it seems that way!). Tried them all. No positive results. Funny that you should ask now in that I accidentally took the one key set with a fob with me on a business trip. I'd kinda given up until yesterday. New thoughts!