1. Get in your vehicle.
2. Close the door.
3. Put key in ignition
4. Do not turn on the ignition yet.
5. Hold down on the unlock button on the door panel. Do not let up.
6. Turn the key to ON, OFF, ON, OFF (while still holding the unlock button on the door panel).
7. Release the unlock button.
8. The door locks should cycle, indicating that you did everything correctly.
9. Have all your remote entry fobs available. Hold down on both the lock and unlock buttons until the door locks cycle. Do the same on all key fobs. This will re-program all of them.
10. Turn ON the ignition key to exit the program mode.
11. DONE.
SOURCE: Key fob stopped working the door locks. I changed
the circuit boards on those factory remotes, sometime break where the battery is clipped in, check to make sure the solder is holding the clip properly and it is not loose, also they remote may need to be programmed to the vehcile with a scan tool, usually only found at GM, Also the rubber part of the remote on the inside where the pad touchs the circuit board, uses a small screwdriver and touch the exposed circuit, if the remote locks the doors, try putting in tiny peice of alumumn tape of the inside pad, the connectiveness of the rubber wears off. If not try above or dealer.
SOURCE: 2005 cobalt ls, 24000 mi,
Most commonly if this is a bad receiver, when receiver start going bad they will work and not worked intermittently. The most you can do at this point is try to reprogram the system and see if it begins to work properly again otherwise it's gonna be time to replace the receiver. Part of the receiver is working, see the receiver receives your signal
but then it must perform an action and it's the action part of the
receiver that has the problem.
If the reprogramming must be done at the dealer with a factory scanner, unfortunately the other scanners available will not do this.
Keep in mind that the best place to possibly get a replacement key fob would be from the dealership. They will be able to sell you the fob and program it to your vehicle for you as well. Also if you need any extra keys you can get them there as well.
Hope this helps. Keep us updated.
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