2003 Mercedes ML-Class Owner's Manual - Page 171

Controls in detail Useful features Canadian programming During programming, your hand-held transmitter may automatically stop transmitting. Continue to press and hold the integrated remote control transmitter button (refer to steps two through four in the "Programming" portion) while you press and re-press ("cycle") your hand-held transmitter every two seconds until the frequency signal has been learned. Upon successful training, the indicator lamp will flash slowly and then rapidly after several seconds. Operation of remote control Turn key in steering lock to position 1 or 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 steering lock to position 1 or 2. Simultaneously hold down the left and right side buttons for approximately 20 seconds, or until the indicator lamp blinks rapidly. The codes of all three channels are erased. i If you sell your vehicle, erase the codes of all three channels. 171