2011 Mercedes E-Class Owner's Manual - Page 80
2011 Mercedes E-Class Manual
Page 80 highlights
78 SmartKey G Warning Opening and closing SmartKey batteries contain perchlorate material, which may require special handling and regard for the environment. Check with your local government's disposal guidelines. California residents, see www.dtsc.ca.gov/ HazardousWaste/Perchlorate/ index.cfm. Checking the battery X Press mechanical key ; into the opening in the SmartKey in the direction of the arrow until battery tray cover : opens. Do not hold the cover closed while doing so. X Press the & or % button. The battery is working properly if battery charge indicator lamp : lights up briefly. X X If battery charge indicator lamp : does not light up briefly during the test, the key batteries are discharged. X Change the key battery (Y page 78). i Consult any authorized Mercedes-Benz Center for a key battery. i If the battery is tested within the signal range of the vehicle, you can open or close the vehicle by pressing & or % respectively. Changing the battery You require a CR 2025 3 V cell battery. X Take the mechanical key out of the SmartKey (Y page 77). Remove the cover of the battery tray. Repeatedly tap the SmartKey against your palm until battery = falls out. X Insert the new battery with the positive pole facing upwards. Use a lint-free cloth to do so. X Insert the front tabs of the battery tray's cover first and then press to close it. X Check the function of all SmartKey buttons on the vehicle.