2009 Mercedes S-Class Owner's Manual - Page 311

Practical hints Vehicle status messages in the multifunction display Display messages Tire Pres. Monitor Wheel Sensor Missing Possible cause/consequence Vehicles with Advanced TPMS (Canada only): One or more sensors are defect (e.g. battery is empty). The respective tire is indicated by - - instead of the tire inflation pressure in the multifunction display. One or more wheels without appropriate wheel sensors mounted (e.g. spare tire). The respective tire is indicated by - - instead of the tire inflation pressure in the multifunction display. Tire Pressure Monitor Currently Unavailable The TPMS (USA only) or Advanced TPMS (Canada only) is unable to monitor the tire inflation pressure due to a nearby radio interference source or insufficient power supply. Possible solution X Have the Advanced TPMS checked at an authorized Mercedes-Benz Center. X Have the wheel sensors installed at an authorized Mercedes-Benz Center. X Have the Advanced TPMS checked at an authorized Mercedes-Benz Center. X Have the wheel sensors installed at an authorized Mercedes-Benz Center. As soon as the causes of the malfunction have been removed, the TPMS or Advanced TPMS becomes active again automatically after a few minutes driving. Z 309