See also:

Clearing the programmed information
Individual buttons cannot be cleared. However, to clear all programming, press and hold the two outside buttons and release when the indicator light begins to flash (approximately 20 seconds). ...

Keyfob (if so equipped)
Keyfob (if so equipped) Replace the battery in the keyfob as follows. 1 Open the lid using a coin A . 2 Remove the battery B . 3 Install a new battery C with the “+” facing down. ● ...

If your vehicle is stolen
If your vehicle is stolen, you should change the codes of any non-rolling code device that has been programmed into HomeLink. Consult the Owners Manual of each device or call the manufacturer ...