Mercedes-Benz GL Operator's Manual page 368

Features
366
opener. The signal is not recognized during
programing. Comparable with Canadian law,
some U.S. garage door openers also feature
a "break".
Proceed as follows:
if you live in Canada
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if you have difficulties programing the
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garage door opener (regardless of where
you live) when using the programing steps
Press and hold one of buttons ; to ? on
X
the integrated garage door opener.
After a short time, indicator lamp : lights
up yellow.
Release the button.
X
Indicator lamp : flashes yellow.
Press button B of garage door remote
X
control A for two seconds, then release it
for two seconds.
Press button B again for two seconds.
X
Repeat this sequence on button B of
X
remote control A until indicator lamp :
lights up green.
When indicator lamp : lights up green:
programing is finished.
When indicator lamp : flashes green:
programing was successful. The next step
is to synchronize the rolling code.
Release button B of remote control A of
X
the garage door drive.
If indicator lamp : blinks red: repeat the
programing process for the corresponding
button on the rear-view mirror. When doing
so, vary the distance between remote
control A and the rear-view mirror.
The required distance between remote
control A and the integrated garage door
opener depends on the garage door drive
system. Several attempts might be
necessary. You should test every position
for at least 25 seconds before trying
another position.
Problems when programing
If you are experiencing problems programing
the integrated garage door opener on the
rear-view mirror, take note of the following
instructions:
Check the transmitter frequency used by
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garage door drive remote control A and
whether it is supported. The transmitter
frequency can usually be found on the back
of the garage door drive remote control.
The integrated garage door opener is
compatible with devices that have units
which operate in the frequency range of
280 to 433 MHz.
Replace the batteries in garage door
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remote control A. This increases the
likelihood that garage door remote control
A will transmit a strong and precise signal
to the integrated garage door opener in the
rear-view mirror.
When programing, hold remote control A
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at varying distances and angles from the
button that you are programing. Try various
angles at a distance between 2and
12 inches (5to 30 cm) or at the same angle
but at varying distances.
If another remote control for the same
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garage door drive is available, repeat the
same programing steps with this remote
control. Before performing these steps,
make sure that new batteries have been
installed in garage door drive remote
control A.
Note that some remote controls only
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transmit for a limited amount of time (the
indicator lamp on the remote control goes
out). Press button B on remote control
A again before transmission ends.
Align the antenna cable of the garage door
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opener unit. This can improve signal
reception/transmission.