Mercedes-Benz 2005 C 240 Operator's Manual page 254

Controls in detail
Useful features
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The indicator lamp 1 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 1 flashes
rapidly, release both buttons.
Step 6:
Press and hold the just-trained
integrated signal transmitter button
and observe the indicator lamp 1.
If the indicator lamp 1 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 1 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.
Rolling code programming
To train a garage door opener (or other
rolling code devices) with the rolling code
feature, follow these instructions after
completing the "Programming" portion
(steps 1 through 6) of this text. (A second
person may make the following training
procedures quicker and easier.)
Step 8:
Locate "training" button on the garage
door opener motor head unit.
Exact location and color of the button
may vary by garage door opener brand.
Depending on manufacturer, the
"training" button may also be referred
to as "learn"or "smart" button. If there
is difficulty locating the transmitting
button, refer to the garage door opener
operator's manual.