Remote keyless entry not working

KEY FOBS FOR THIS MODEL MUST BE PROGRAMED USING A TECH 2 SCAN TOOL SO IT MUST BE DONE AT THE DEALERSHIP FOR ABOUT HALF HOUR LABOR HOPE THIS HELPS

I have a 2003 Monte Carlo and this is the process I used to program replacement key fobs for our car:

1. Turn the ignition to ACC or ON and the radio to off. Do not crank the engine.
2. Press and hold the DISP button on the radio for at least five seconds until settings is displayed.
3. Press the SEEK up or down arrows until FOB PROG appears on the display.
4. Press the PREV or NEXT button to enter the submenu. The current selection will have an asterisk next to it. BEGIN will be displayed.
5. Press the DISP button to start programming. When the message PUSH FOB flashes, press and hold the LOCK and UNLOCK buttons on the first transmitter at the same time for 15 seconds. A chime will be heard to verify the transmitter is learned.
6. Repeat Step 5 for each additional transmitter up to four remotes total. You do not need to press the DISP button again, just press down the LOCK and UNLOCK buttons on the next transmitter to be learned to a maximum of four transmitters per vehicle.

The mode you selected is now set. You can either exit the programming mode by following the instructions later in this section or program the next feature available on your vehicle.

EXIT (Exit Feature Customization Mode): This feature allows you to exit the vehicle customization programming.
To Exit:

1. Scroll until EXIT appears on the display.
2. Press the DISP button to exit programming. A chime will he heard to verify the exit.

Found this in Yahoo answers, Might help ya.

this procedure is actually for the Grand Prix. I would think it is the same for the Monte Carlo. Good luck!

GRAND PRIX KEY FOB PROGRAMMING INSTRUCTIONS

Transmitter Programming
No Tools Required
In the event that a transmitter is lost, program the old and the new transmitters into the memory of the remote control door lock receiver. Up to 4 transmitters may be programmed.


Important
Once the keyless entry receiver enters the programming/diagnostic mode, the programming of the first transmitter erases all previous transmitter programming information. You must then program all of the transmitters.

Program only 1 vehicle remote control door lock receiver at a time. If you program multiple receivers simultaneously, the same transmitter could possibly be programmed to more than 1 remote control door lock receiver.


Perform the following steps:

Sit in the vehicle driver's seat. (actually it’s much ezr from the front pass seat)
Remove the ignition key from the ignition lock cylinder.
Close all of the vehicle's doors.
Remove the MALL PGM fuse from the fuse panel. Refer to Electronic Diagnosis in Body and Chassis.
Turn the ignition lock cylinder to the ACC position.
Turn the ignition lock cylinder OFF, then back to ACC within 1 second.
Open and then close any vehicle door. You will hear a chime when the remote control door lock receiver enters the programming/diagnostic mode. If you do not hear a chime, start again at step 1.

Important
After 7 seconds, you may hear a chime confirming successful synchronization. After approximately 14 seconds, you will hear a chime confirming successful programming.


Press and hold the transmitter LOCK and UNLOCK buttons simultaneously for 14 seconds.
Repeat step 8 in order to program each additional transmitter.
Remove the ignition key from the ignition lock cylinder.
Install the MALL PGM fuse back into the fuse panel. Refer to Electrical Diagnosis in Body and Chassis.
Validate that all the transmitters that were programmed operate properly. Refer to Keyless Entry System Operation
Source(s): <http://www.subatomicdesign.com/gtp/forum... >