2003 Mercedes SL-Class Owner's Manual - Page 211

Controls in detail Useful features Operation of remote control Turn key in starter switch to position 2. Select and press the appropriate button to activate the remote controlled device. The integrated remote control transmitter continues to send the signal as long as the button is pressed - up to 20 seconds. Erasing the remote control memory Turn key in starter switch to position 2. Simultaneously hold down the left and right side buttons for approximately 20 seconds, or until the control lamp blinks rapidly. The codes of all three channels are erased. i If you sell your vehicle, erase the codes of all three channels. 211