See also:

Programming
Do not program HomeLink with the vehicle parked in the garage. Note: Your vehicle may require the ignition switch to be turned to the accessory position for programming and/or operation of the Home ...

Troubleshooting
...

Sounding a panic alarm
Press to activate the alarm. The horn will sound and the turn lamps will flash for a maximum of three minutes. Press again or turn the ignition on to deactivate, or wait for the alarm to time o ...