Hi All!
All 3 door unlocking key fobs quit working on the same day, so I wished to try to re-program, to see if that would solve the problem. No luck. It won't go into programming mode.

I'd like to check the antenna connection and the connection at the receiver module to see if a connection is corroded or a wire fell off. However, i can't find out where they are located in the vehicle.
I asked a couple of local mechanic shops and they said the dealer is where to ask. The dealer said to bring it in for diagnostics for a cost. I prefer to try myself before spending.

Do any of you know where the antenna is and where the receiver module is located in the truck?

Thanks For Helping!
Paul

PS: In case it is helpful: 2000 Sierra 3-Door XLT 4 wheel drive 6.2 Litre engine.