GMC Sierra 2014 Owner's Manual page 189

6. Inside the vehicle the vehicle,
press and hold the newly
programmed Universal Remote
system button for two seconds
and then release it. If the garage
door does not move or the lamp
on the garage door opener
receiver does not flash, press
and hold the same button a
second time for two seconds,
then release it. Again, if the door
does not move or the garage
door lamp does not flash, press
and hold the same button a third
time for two seconds, then
release it.
The Universal Remote system
should now activate the
garage door.
Repeat the process for
programming the two remaining
buttons.
Radio Signals for Canada and
Some Gate Operators
For questions or programming help
call 1-800-355-3515 or see
www.homelink.com.
Canadian radio-frequency laws and
some U.S. gate operators require
transmitter signals to time out or
quit after several seconds of
transmission. This may not be long
enough for the Universal Remote
system to pick up the signal during
programming.
If the programming did not work,
replace Step 2 under Programming
the Universal Remote System with
the following:
Instruments and Controls
Press and hold the Universal
Remote system button while
pressing and releasing the
hand-held transmitter button every
two seconds until the signal has
been successfully accepted by the
Universal Remote system. The
Universal Remote system indicator
light will flash slowly at first and then
rapidly. Proceed with Step 3 under
Programming the Universal Remote
System to complete.
5-53