2003 Mercedes S-Class Owner's Manual - Page 92

Controls in detail Locking and unlocking Press and hold programming button 1 until "Driver's door" symbol 2 lights up. The KEYLESS-GO card will then function as follows: Unlocking the driver's door Grasp the driver's door handle. Global unlocking Grasp the door handle on the passenger side. Global locking Press lock button at door handle or trunk lid. Restoring to factory setting Press and hold programming button 1 until "Central unlock" symbol 3 lights up. Checking the batteries Briefly press programming button 1. The KEYLESS-GO card batteries are in order if the indicator lamp for either "Driver's door" 2 or "Central unlock" 3 comes on red or green. ! If you cannot lock or unlock the vehicle with the KEYLESS-GO card, then either the batteries of the KEYLESS-GO card are discharged or the KEYLESS-GO card is malfunctioning. Check the batteries of the KEYLESS-GO card ( page 89) and replace them if necessary ( page 328). or Use the SmartKey to unlock the doors ( page 30) and trunk ( page 98) as required. Lock the vehicle using the SmartKey ( page 93). If your KEYLESS-GO card is malfunctioning, contact your authorized Mercedes-Benz Center. ! If symbols 2 or 3 do not light up during the check, then the batteries of the KEYLESS-GO card are discharged. Change the batteries ( page 328). You can obtain the batteries at any authorized Mercedes-Benz Center. 92