2005 Mercedes SL-Class Owner's Manual - Page 293

Operation Tires and wheels i After you have reactivated the tire inflation pressure monitor, the current tire inflation pressures will only be shown after a few minutes driving time. During this time, you will see the following message in the display: Tire pressure displayed only after driving a few minutes Press button è or ÿ on the multifunction steering wheel repeatedly until the standard display menu appears in the multifunction display ( page 134). Press button j or k repeatedly until the current tire inflation pressures for each tire appear in the multifunction display. Warning! G i Possible differences between the readings of a tire inflation pressure gauge of an air hose, e.g. gas station equipment, and the vehicle's control system can occur. The readings issued by the control system are more precise. Switch on the ignition ( page 36). i You can select the unit of measure (Bar/Psi) used for the tire inflation pressure by changing the setting in the control system ( page 156). When the tire inflation pressure monitoring system warning light is lit, one or more of your tires is significantly under-inflated. You should stop and check your tires as soon as possible, and inflate them to the proper tire inflation pressure as indicated on the vehicle's tire information placard. Driving on a significantly under-inflated tire causes the tire to overheat and can lead to tire failure. Under-inflation also reduces fuel efficiency and tire tread life, and may affect the vehicle's handling and stopping ability. Each tire, including the spare, should be checked monthly when cold and set to the recommended tire inflation pressure as specified in the vehicle placard and owner's manual. 291