2011 Mercedes C-Class Owner's Manual - Page 134

132 Driving If you cannot turn the SmartKey in the ignition lock, the vehicle battery may not be charged sufficiently. X Check the vehicle battery and charge if necessary (Y page 261). or X Jump-start the vehicle (Y page 262). Driving and parking i The SmartKey can be turned in the ignition lock even if it is not the correct SmartKey for the vehicle. The ignition is not switched on. The engine cannot be started. KEYLESS-GO Vehicles with KEYLESS-GO are equipped with a SmartKey with an integrated KEYLESS-GO function and a detachable Start/Stop button. The Start/Stop button must be inserted in the ignition lock and the SmartKey must be in the vehicle. Pressing the Start/Stop button several times in succession corresponds to the different key positions in the ignition lock. This is only the case if you are not depressing the brake pedal. If you depress the brake pedal and press the Start/Stop button, the engine starts immediately. The Start/Stop button can be removed from the ignition lock. Then you can insert the SmartKey in the ignition lock. : Start/Stop button ; Ignition lock X Insert Start/Stop button : into ignition lock ;. i When you insert Start/Stop button : into ignition lock ;, the system requires a detection time of two seconds before you can use Start/Stop button :. X Vehicles with manual transmission: shift to neutral. Vehicles with automatic transmission: shift the transmission to position N. Do not press the brake pedal. or X X i You do not have to remove the Start/Stop button from the ignition lock when you leave the vehicle. However, you should always take the SmartKey with you when leaving the vehicle. The vehicle can be started with the Start/Stop button and the electrical equipment can be operated while the SmartKey is in the vehicle. Start/Stop button = USA only ? Canada only