One of the keys to my blue roadster quit working for lock/unlock a while back. Checked batteries, they were good, played with the battery + contacts a little, they looked good, the red light flashed so I tried the resync procedure. Put key in switch, pressed button twice and turned to run position, tried three times with no luck. Decide to try one more time and I accidentally turned the key to start, the car started and then the locking function worked. Just thought I would pass that along, maybe it will help someone.