Mercedes-Benz 2005 C 230 Kompressor Operator's Manual page 275

Controls in detail
Useful features
Erasing the remote control memory
Switch on the ignition.
Simultaneously hold down the signal
transmitter buttons 2 and 4, for
approximately 20 seconds, until the
indicator lamp 1 blinks rapidly. Do not
hold for longer than 30 seconds.
The codes of all three channels are
erased.
i
If you sell your vehicle, erase the codes
of all three channels.
274
Reprogramming a single integrated
signal transmitter button
To program a device using a signal trans-
mitter button previously trained, follow
these steps:
Press and hold the desired signal trans-
mitter button (2, 3 or 4). Do not
release the button.
The indicator lamp will begin to flash af-
ter 20 seconds. Without releasing the
integrated signal transmitter button,
proceed with programming starting
with step 3.