Would like instructions to program a remote for 05 buick lasabre limited. I have put new battery in and held 5 feet and press the two buttons for 7 seconds with no results. If I purchase a new remote, how do I program. Thanks

2006 Buick Rendezvous Remote Programming For Buick Rendezvous / Intrigue / AztekObtain all remote transmitters for this vehicle.
1. Close all doors.
2. Press and hold the Unlock button on door lock switch on drivers door.
Hold until instructed to release in step 6.
3. Insert key into the ignition cylinder but do not turn it.
4. Remove key from ignition and then insert key into ignition without turning ignition cylinder and remove key.
5. Insert key in ignition a third time and leave key in ignition. Do Not turn ignition.
6. Release door lock switch on drivers door panel. A Chime will sound 3 times indicating that you are in programming mode.
7. Press both the Lock and Unlock buttons on the remote up to 30 seconds.
A chime will sound 2 times if remote has programmed successful.
8. Repeat step 7 if you are programming additional remotes.
9. Remove key from ignition to exit programming mode

If the remotes are original to the car then you probably have one of two problems. 1 is that the pads are worn out and you should buy a aftermarket case and button pad from autozone it will cost you about $15.
2. Is the battery is not getting g a complete connection. Look at the little metal piece that the battery slides into and check the 3 points that it is soldered too. If any are broken loose it will not work directly or at all. It will require it to be soldered into place.

their is a way to do it but recheck battery first sometimes the relearn process doesnt work or the fob itself is dead also if auto /remote start will need dealer to flash fob ---- 2002 santa fe and followed programming instructions and eventually was able to program the new remote. But, I did not realize I had to program my existing remote at the same time. Since, I have retried programming both remotes many times with no success--the new one works, but the old one won't. The instructions were: 1) Locate switch under dash, behind fuse box; 2) Turn ignition switch on, but don't start engine; 3) Wait 5 seconds, set memory switch to SET position; 4) Press remote LOCK button; press second remote transmitter LOCK button; 5) Set memory switch to OFF; 6) Switch ignition OFF. 7) Confirm programming by locking and unlocking vehicle.
Remote Key Programming Hyundai Forums Hyundai Forum

look for a red reset button on the remove control computer in the car

not sure if you did all these steps but maybe it'll help....

https://northcoastkeyless.com/2003-gmc-yukon-denali-keyless-entry-remote-programming-instructions/

TO SYNCHRONIZATION REMOTES WHEN REPLACING BATTERIES,STAND 5 FEET OF THE VECHICLE.PRESS REMOTE TRANSMITTER LOCK AND UNLOCK BUTTONS SIMULTANEOUSLY FOR 7 SECONDS.HORN SHOULD CHIRP TO CONFIRM SYNCHRONIZATION.

Transmitter ProgrammingImportant: All transmitters which 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 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.

1. Install a scan tool.
2. Use the scan tool in order to access programming: Vehicle Control System/Computer Integrating System/Module Setup/BCM/Program Key Fobs.
3. Press the START soft key on the scan tool. Important: The scan tool must stay connected until all of the transmitters are programmed.
   
4. Press and hold the LOCK button and the UNLOCK button simultaneously on one transmitter. After a delay of 5-10 seconds, the scan tool will indicate that the transmitter is programmed.
5. Repeat the previous step in order to program up to 4 transmitters.
6. Remove the scan tool.
7. Operate the transmitter functions in order to verify correct system operation.

Good luck

NOTE: Some vehicles may require the ignition to be turned on or to the second (or"accessory") position for programming and/or operation of HomeLink. It is also recommended that a new battery be replaced in the hand held transmitter of the device being programmed to HomeLink for quicker training and accurate transmission of the radio frequency. Please use a ladder and do not stand on your vehicle during the programming steps for a rolling code opener.

Rolling Code Programming:
1. Press and hold the two outer HomeLink buttons until the indicator light begins to flash (after 20 seconds). Do not hold for longer than 30 seconds. Do not repeat this step to program additional HomeLink buttons.

2. Place the hand-held remote 1-3 inches from the HomeLink button you want to program.

3. Simultaneously, press and hold both the HomeLink and hand-held remote buttons. Do not release either button until step 4 has been completed. (If you reside in Canada, refer to the "NOTE" below.)

4. When the indicator light changes from a slow blink to a rapid flash, release both buttons.

5. At the garage door opener receiver (motorhead unit) in the garage, locate the"learn" or "smart" button (usually near where the hanging antenna wire is attached).

6. Press and release this "learn" or "smart" button. (The name of these buttons vary by manufacturer.) There are 30 seconds in which to initiate step 7.

7. Firmly press, hold for two seconds, and release the programmed HomeLink button. Do this procedure again and, depending on the make of your garage door opener, do this procedure a third time to complete the procedure.

The garage should now activate when the programmed HomeLink button is firmly pressed and released. If not, give us a call or refer to the "Troubleshooting Tips" noted below. NOTE: If you reside in Canada, replace step three with the following: Press and hold the desired HomeLink button and "cycle" the hand-held remote. To cycle: Press and release the hand-held remote button every two seconds until the indicator light changes from a slow blink to a rapid flash(step four).

Troubleshooting Tips:

** Check the frequency of the garage door opener's hand-held remote (usually found on the back). HomeLink is compatible with radio-frequency devices operating between 288-399 Mhz.

** Put a brand new, store bought battery in the hand held remote. During the programming process (step three above) the battery's energy tends to drain (more so with an older battery). A new battery will increase the speed and accuracy in which the hand-held remote sends its signal to HomeLink.

** Retrain HomeLink holding the hand-held remote at different lengths and angles from the HomeLink button you are trying to program (during programming step three). Try 4-6 inches away at a different angle.

** Confirm that the HomeLink button you are trying to program is in the "programming mode". Press and hold the desired button. The indicator light will be a slow blink when HomeLink is in the "programming" mode and can be programmed at any time.

Verifying HomeLink has picked up a rolling code signal:

** Press and hold the programmed HomeLink button. If the indicator light blinks rapidly for two seconds and turns solid, HomeLink has successfully picked up the rolling code signal. If necessary, proceed with steps 5-7 noted above to complete the rolling code programming.

Have you checked the fluid level in the master cylinder?

1. Close all doors.
2. Press and hold the Unlock button on door lock switch on drivers door.
Hold until instructed to release.
3. Insert and remove key from ignition 2 times. Do Not turn ignition.
4. Insert key in ignition a third time and leave key in ignition. Do Not turn ignition.

5. Release door lock switch on drivers door panel.
A Chime will sound 3 times indicating that you are in programming mode.
6. Press both the Lock and Unlock buttons on the remote up to 30 seconds.
A chime will sound 2 times if remote has programmed successful.
7. Repeat step 6 if you are programming additional remotes.
8. Remove key from ignition to exit programming mode.