Key Fob help please!
Or, if you've got the owner's manual, it should be in there. If these fail, just google it, there're all kinds of sites that talk about reprogramming remotes-a $40 service at the dealership. There is no need to mess with the shock sensor in the trunk, it's strictly with the key fob, your door locks and your ignition...
As for your situation, I bought one for my dad for Christmas for his Sonoma that didn't come with one at all. I found out searching online that it came with two types in 2002, and you had to locate the receiver box under the dash and match the numbers on it. I think it was $20 shipped off ebay for a slighly used one. It came with programming instructions as well. It was actually listed on ebay to match a silverado.
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Remote Control Door Lock Transmitter Programming
Important: All transmitters which are to be recognized by the body control module (BCM) must be programmed in a single programming sequence. If the system is placed in program mode it will erase all previously programmed transmitters upon the receipt of the programming signal from the first transmitter. Up to 4 transmitters can be programmed. Do not operate or program the transmitters in the vicinity of other vehicles that are in the keyless entry program mode. This prevents the programming of the transmitters to the incorrect vehicle.
Turn the ignition switch to the OFF position.
Remove the RADIO (#17) fuse.
While pressing the drivers door unlock switch, cycle the ignition switch from the OFF position to the RUN position 3 times within 5 seconds. The BCM will confirm entry into the programming mode by performing the following actions:
3.1. Locking both of the doors.
3.2. Unlocking the drivers door.
3.3. Releasing the rear compartment lid.
Press and hold the LOCK button and the UNLOCK button simultaneously on one transmitter for approximately 15 seconds. The BCM will confirm the programming of that transmitter by performing the following actions:
4.1. Locking both of the doors.
4.2. Unlocking the drivers door.
4.3. Releasing the rear compartment lid.
Repeat the previous step to program up to 4 transmitters.
Replace the RADIO (#17) fuse.
Operate the transmitter functions in order to verify correct system operation.
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p.s. I don't have an owner's manual
p.s. I don't have an owner's manual
try checking the RPO codes in the door to see if your car came with key less entry, not sure if that matters to make it go into program mode? also did you have your door closed when you try the program mode? so far i've gathered that, that is how your supposed to do it. correct me if im wrong anyone. 




thanks for the help