2005 Mercedes E-Class Owner's Manual - Page 393
2005 Mercedes E-Class Manual
Page 393 highlights
Practical hints What to do if ... Display symbol Display messages Key Check battery Key not recognized Possible cause The SmartKey with KEYLESS-GO* batteries are discharged. The SmartKey with KEYLESS-GO* is not recognized while the engine is running because the SmartKey with KEYLESS-GO* is not in the vehicle there is strong radio-frequency interference The SmartKey with KEYLESS-GO* is momentarily not recognized. Possible solution Change the batteries ( page 415). Stop the vehicle as soon as it is safe to do so. Search for the SmartKey. Otherwise the vehicle cannot be centrally locked nor can the engine be started again after the engine is stopped. Change the position of the SmartKey in the vehicle. Operate the vehicle with the SmartKey in the starter switch if necessary. F 391