I just purchased a Used 05 TSX, no key fobs, I ordered one on Ebay and followed the programming instructions here, they seemed to work, the key fob will now lock the doors, the trunk opens, but the fob will not Unlock??? it all seems to work except for the unlock button??

Any suggestions? Could it be something to do with fcc id or bad fob or what?

 

There was a thread on this earlier. Try searching. Something to do with either buying an 06 fob with Driver 1/2 instead of the 04/05 fob, or pressing the LOCK UNLOCK simutaneously which unlinks the Driver 1/2 function and allows the fob to unlock the car. Appearently the extra signal the new Fob sends out for the driver memory messes up the non memory cars. Try the LOCK-UNLOCK to unlink the fob first.

 

Other than searching for programming "key fobs" I don't know what else to look for, I assumed my problem was NEW to this forum. If you have a link to the thread you are referring to, post it.

 

I suppose the fob I purchased is for a 06 TSX, I solved the issue by simply pressing Lock/Unlock at the same time and watching for two short flashes on the fob, this fixed the Unlock button.

Thanks to this site..