2010 Mercedes S-Class Owner's Manual - Page 327

Transfer case In manual program mode M, upshift indicator ; in the multifunction display advises you to upshift before the engine reaches the overspeed range. Thus you can drive at the maximum engine speed for each gear without overrevving the engine. X Shift the automatic transmission from current gear : into the next higher gear. The fuel supply will otherwise be interrupted to prevent the engine from overrevving. 325 Deactivating manual shift program X Press the program mode selector switch repeatedly until C or S appears in the multifunction display. or X Restart the engine. The automatic transmission will go to automatic program mode C. Manual program mode M is not stored. Downshifting G Warning! On slippery road surfaces, never downshift in order to obtain braking action. This could result in drive wheel slip and reduced vehicle control. Your vehicle's ABS will not prevent this type of loss of control. X Emergency operation (limp-home mode) If vehicle acceleration becomes less responsive or sluggish or the automatic transmission no longer shifts, the automatic transmission is most likely operating in limphome (emergency operation) mode. In this mode only second gear and reverse gear R can be selected. X Stop the vehicle in a safe location. X Shift the automatic transmission into park position P. X Turn off the engine. X Wait at least 10 seconds before restarting. X Restart the engine. X Shift the automatic transmission into drive position D (for second gear) or reverse gear R. X Have the automatic transmission checked at an authorized Mercedes-Benz Center as soon as possible. Briefly pull left gearshift control : (Y page 323). The automatic transmission shifts into the next lower gear. i For maximum acceleration, pull and hold the left gearshift control. Depending on the engine speed the automatic transmission selects the optimal gear for maximum acceleration. i When you brake or stop, the automatic transmission shifts down into a gear from which you can easily accelerate or take off. Kickdown Using the kickdown while driving in manual program mode M is not possible. Transfer case This section applies to vehicles equipped with all-wheel drive (4MATIC) only. Both the front and rear axles are powered at all times when the vehicle is being operated. ! Only conduct operational or performance tests on a two-axle dynamometer. If such tests are necessary, contact an authorized Mercedes-Benz Center. You could Z Controls in detail