I have programed a few different doors to homelink in 3,5,x5 and I have had my struggles.
1) I just because your remote opens your garage door, does not mean it will work to sync your homelink. This may be a confusing statement, but I have 3 remotes for my garage and I can only program my cars(homelink) with 1 of the remotes. The other two WILL NOT code my BMW's, wierd I know.
2) are you continuously and simultaneously holding the buttons down and at close proximity? just checking...
3) If you have the ability, you may want to have a second person. On one garage door, I had my wife push the learn button while i pushed the homelink.
4) On my 08 550, i had to push and hold the homelink button 3 times for 3 seconds each for it to recognize (while the learn button on the garage door was on).
There is one more thing. How old is your garage door? I remember reading that there are some new garage doors which will not work with the Homelink. You have to get a secondary receiver which sync's with the garage door and then you sync the homelink with the secondary receiver. If you go to the homelink site, you can find more information.
I hope this helps
I hope this helps.
17 M3 ZCP -- 12 X5 50i Sport
--- Laid to rest----
11 M3 DCT -- 2011 X5 50i (Lemon) -- 2008 550 Msport -- 2007 x5 4.8 sport -- 2004 545 sport -- 2002 x5 4.4 sport -- 2001 540i Msport
2000 SL500 -- 1997 SL500