2005 Mercedes C-Class Owner's Manual - Page 166

Controls in detail Automatic transmission* Steering wheel gearshift control (Speedshift) (C 55 AMG only) You can change the gears manually on the steering wheel or by using the gear selector lever ( page 158). The steering wheel gearshift buttons are located to the left and right of the steering wheel. i You cannot shift with the steering wheel gearshift buttons when the gear selector lever is in position P, N or R. The manual program mode M will not be stored. When the engine is turned off with the manual program mode M selected, the transmission will go to the automatic program mode (C or S) when the engine is restarted. The last selected program mode (C or S) is switched on when the engine is restarted in the automatic program mode. ! Allow engine to warm up under low load use. Do not place full load on the engine until the operating temperature has been reached. Shift into reverse gear R only when the vehicle is stopped. Avoid spinning of a drive wheel for an extended period when driving off on slippery road surfaces. This may cause serious damage to the drivetrain which is not covered by the Mercedes-Benz Limited Warranty. 1 Left button: downshift 2 Right button: upshift 164