2005 Mercedes C-Class Owner's Manual - Page 260

Controls in detail Useful features Programming or reprogramming the integrated remote control Step 1: Switch on ignition ( page 33). Step 2: If you have previously programmed an integrated signal transmitter button and wish to retain its programming, proceed to step 3. Otherwise, press and hold the two outer signal transmitter buttons 2 and 4 and release them only when the indicator lamp 1 begins to flash after approximately 20 seconds (do not hold the button for longer than 30 seconds). This procedure erases any previous settings for all three channels and initializes the memory. If you later wish to program a second and/or third hand-held transmitter to the remaining two signal transmitter buttons, do not repeat this step and begin directly with step 3. 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 interior rear view mirror, keeping the indicator lamp 1 in view. Step 4: Using both hands, simultaneously press the hand-held transmitter button 5 and the desired integrated signal transmitter button (2, 3 or 4). Do not release the buttons until completing step 5. The indicator lamp 1 on the integrated remote control will flash, first slowly and then rapidly. i 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. 258