2011 Mercedes C-Class Owner's Manual - Page 204
2011 Mercedes C-Class Manual
Page 204 highlights
202 Display messages Display messages Possible causes/consequences and M Solutions The SmartKey needs to be replaced. X Visit a qualified specialist workshop. The batteries of the KEYLESS-GO key are discharged. X Change the batteries (Y page 74). The display message is displayed for a maximum of 60 seconds and is just a reminder. You have opened the driver's door with the engine switched off. The KEYLESS-GO key is not in the ignition lock. X Take the KEYLESS-GO key with you when leaving the vehicle. The KEYLESS-GO key is not in the vehicle. A warning tone also sounds. If the engine is switched off, you can no longer lock the vehicle centrally or start the engine. X Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions. X Engage the parking brake. X Locate the KEYLESS-GO key. The KEYLESS-GO key is not detected while the engine is running because there is interference from a strong source of radio waves. A warning tone also sounds. X Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions. X Engage the parking brake. X Operate the vehicle with the KEYLESS-GO key in the ignition lock if necessary. On-board computer and displays + Obtain a new key + Replace Key Battery + Don't Forget Your Key + Key Not Detected (red display message) + Key Not Detected (white display message) The KEYLESS-GO key cannot be detected at present. X Change the location of the key with the KEYLESS-GO functions in the vehicle. If the KEYLESS-GO key is still not detected: X Change the location of the key with the KEYLESS-GO functions in the vehicle. X Operate the vehicle with the KEYLESS-GO key in the ignition lock if necessary.