2003 Malibu Keyless Entry Programming

I bought fobs for my 2003 Impala (which were super easy to program BTW) and I have one extra I am trying to program for my sister's 2003 Malibu. I saw the other threads about programming the 2002 malibu, Do I need the scan tool to program the keyless entry fobs for a 2003 Malibu?

Well it definitely looks like the 2002/3 Malibu has a Keyless entry module which communicates on GM's Class 2 serial data link while the 2003 Impala has a data link to the BCM.

To me this means likely these fobs aren't compatible.

I am surprised you could program 2003 Impala without using a scan tool because service manual says you do. Maybe there is more than 1 way?

This worked for my 2003 Impala, just not the Malibu (or course it couldn't have been easy):

http://www.automotiveforums.com/vbulletin/showthread.php?t=107996

Non scan tool Method:
1) To program the RKE transmitter, you must enter the customization main menu through the radio. Turn the ignition switch on to ON or ACC position and turn the radio off. Press and hold the DISP button on the radio for at least 5 seconds until SETTINGS is displayed. Using SEEK up or down arrow keys, scroll until FOB PROG appears on the display. Press PREV or NEXT button to enter lower menu. BEGIN will be displayed.

2) Press DISP button to start programming. When PUSH FOB message flashes, press and hold both LOCK and UNLOCK buttons on the RKE transmitter for 15 Seconds. A chime will be heard to verify transmitter is learned.
3) Repeat step 2) for each transmitter to be used. All transmitters must be programed in the same programming sequence.
4) Scroll until EXIT appears in the display. Press DISP button to exit programming. A chime will sound to verify exit.