GM did not provide a way to do this without a Tech II scanner but here is the process if you have a scanner available.
Important: All transmitters that are to be recognized by the remote control door lock receiver (RCDLR) must be programmed in a single programming sequence. If the system is placed in program mode, all previously programmed transmitters will be erased upon 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. The order in which the transmitters are programmed is important. The first transmitter programmed will be transmitter #1, and the second transmitter programmed will be transmitter #2. Use care to program the transmitters correctly.
The scan tool must stay connected until all of the transmitters are programmed. All doors must be closed to perform this function.
SOURCE: programming instructions for a 1999 Chrysler 300M remote fob
Manual Programming Procedure (non scan tool)
1. Connect pin 1 of the 16-way data link connector to chassis ground or to pin 4 of
the 16-way data link connector.
2. Close all doors, turn ignition key to off.
3. Turn ignition key to Accessory.
4. Turn ignition to off, door locks will cycle once (in programming mode).
5. For each key FOB, press any button 3 times in a row to program code. When
programming is complete, the door locks will cycle once.
NOTE:
IF A SECOND KEY FOB REQUIRES PROGRAMMING, IT MUST BE PROGRAMMED WITHIN 1 MINUTE OF
PROGRAMMING
THE FIRST FOB PROGRAMMING. PRESS ANY BUTTON ON THE SECOND FOB 3 TIMES TO PROGRAM ITS CODE. WHEN PROGRAMMING IS COMPLETE, THE DOOR LOCKS WILL CYCLE ONCE.
6. The programming mode finishes after the following:
a. Programming of two key FOBS is completed.
b. One minute has passed since programming.
c. Pin 1 of 16-way data link connector is removed from ground connection.
d. Ignition switch is turned on.
e. Any of the doors are opened.
SOURCE: Remote Keyless Entry fob for my 2007 Suzuki XL7
Not 100% sure about Suzukis but on my ford the same happened to me and I had to program them at the same time. Hopefully this helps.
SOURCE: programming key less entry unit
If you have the owners manual it should be in there. My 2003 Mercury Sable manual tells me how to set one up.
SOURCE: program fob/reset keyless entry pad 95 cougar
If you open trunk and look on inside of trunk where hinge bolts are you will see code numbers . Owners manual will tell you how.
SOURCE: How do you program a remote keyless entry key fob?
go to the link for instructions.
http://www.programyourremote.com/classified/DisplayAd.asp?id=1468
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