I didn't find the fuse location. But here are the directions to clear all the homelink buttons. Not sure it will help but might be worth a try.
Clearing a HomeLink Device
To erase programming from the three
HomeLink buttons press and hold the two
outer HomeLink buttons until the indicator
light begins to flash. The indicator light will
begin flashing in 10 to 20 seconds, at which
time both buttons should be released.
Programming has now been erased, and
the indicator light should blink slowly to
indicate the device is in train mode when
any of the three HomeLink buttons are
pressed.