Mercedes-Benz ML350 Operator's Manual page 293

Controls in detail
Useful features
Step 3:
Hold the end of the hand-held remote
control transmitter 6 of the device
you wish to train approximately 2 to
5 in (5 to12 cm) away from the surface
of the integrated remote control
located on the left side of the interior
rear view mirror, keeping the indicator
lamp 4 in view.
Step 4:
Using both hands, simultaneously
press the hand-held transmitter
button 5 and the desired integrated
signal transmitter button (1, 2
or 3). Do not release the buttons until
completing step 5.
The indicator lamp 4 on the
integrated remote control will flash,
first slowly and then rapidly.
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The indicator lamp 4 flashes the first
time the signal transmitter button is
programmed. If this button has already
been programmed, the indicator lamp
will only start flashing after
20 seconds.
Step 5:
When the indicator lamp 4 flashes
rapidly, release both buttons.
Step 6:
Press and hold the just-trained
integrated signal transmitter button
and observe the indicator lamp 4.
If the indicator lamp 4 stays on
constantly, programming is complete
and your device should activate when
the integrated signal transmitter
button is pressed and released.
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If the indicator lamp 4 flashes rapidly
for about two seconds and then turns
to a constant light, continue with
programming steps 8 through 12 as
your garage door opener may be
equipped with the "rolling code"
feature.
Step 7:
To program the remaining two buttons,
repeat the steps above starting with
step 3.