Erasing HomeLink buttons

To erase the three programmed buttons (individual buttons cannot be erased):
• Press and hold the two outer HomeLink buttons until the indicator light begins to flash-after 20 seconds. Release both buttons. Do not hold for longer that 30 seconds.

HomeLink is now in the train (or learning) mode and can be programmed at any time beginning with Step 1 in the Programming section.
See also:
Accessory delay
With accessory delay, the window switches, audio system and moon roof
(if equipped) may be used for up to 10 minutes after the ignition is
turned off or until either front door is opened. ...
Reprogramming a single HomeLink button
To program a device to HomeLink using a HomeLink button previously
trained, follow these steps:
1. Press and hold the desired HomeLink button. Do NOT release the
button.
2. The indicator ligh ...
Determining if the system is operational
The supplemental restraint system uses a warning indicator light in the
instrument cluster or a backup tone to indicate the condition of the
system. Refer to the Warning lights and chimes section ...
