See also:

HomeLink universal transceiver (if so equipped)
The HomeLink Universal Transceiver provides a convenient way to consolidate the functions of up to three individual hand-held transmitters into one built-in device. HomeLink Universal Transceiver: ...

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 Owner’s Manual of each device or call the manufact ...

Air pollution
Industrial pollution, the presence of salt in the air in coastal areas, or heavy road salt use accelerates the corrosion process. Road salt also accelerates the disintegration of paint surfaces. ...