|
|
|
the information on display messages ( Y page 306). It may take up to ten minutes for a malfunction of the tire pressure monitor to be indicated. A malfunction will be indicated by the tire pres- sure warning lamp flashing for approximately one minute and then remaining lit. When the malfunction has been rectified, the tire pressure warning lamp goes out after a few minutes of driving. The tire pressure values indicated by the on- board computer may differ from those meas- ured at a gas station with a pressure gauge. The tire pressures shown by the on-board computer refer to those measured at sea level. At high altitudes, the tire pressure values indicated by a pressure gauge are higher than those shown by the on-board computer. In this case, do not reduce the tire pressures. The operation of the tire pressure monitor can be affected by interference from radio transmit- ting equipment (e.g. radio headphones, two-way radios) that may be being operated in or near the vehicle. Checking the tire pressure electroni- cally X Make sure that the SmartKey is in position 2 in the ignition lock ( Y page 162). X Use ò on the steering wheel to call up the list of menus. X Press 9 or : on the steering wheel to select the Service menu. X Press the a button. X Press 9 or : to select Tire Pres‐ sure . X Press the a button. The current tire pressure of each tire is shown in the multifunction display. If the vehicle was parked for longer than 20 minutes, the following message appears: Tire pressure will be displayed after driving a few minutes . After a teach-in process, the tire pressure mon- itor automatically detects new wheels or new sensors. As long as a clear allocation of the tire pressure value to the individual wheels is not possible, the Tire Pressure Monitor Active message is shown instead of the tire pressure display. The tire pressures are already being monitored. Tire pressure monitor warning mes- sages If the tire pressure monitor detects a pressure loss in one or more tires, a warning message is shown in the multifunction display. The yellow tire pressure warning lamp then lights up. R If the Please Correct Tire Pressure message appears in the multifunction display, the tire pressure in at least one tire is too low. The tire pressure must be corrected when the opportunity arises. R If the Check Tires message appears in the multifunction display, the tire pressure in at least one tire has dropped significantly. The tires must be checked. R If the Warning Tire Malfunction message appears in the multifunction display, the tire pressure in at least one tire has dropped sud- denly. The tires must be checked. Observe the instructions and safety notes in the display messages in the "Tires" section ( Y page 306). If the wheel positions on the vehicle are rotated, the tire pressures may be displayed for the wrong positions for a short time. This is rectified after a few minutes of driving, and the tire pres- sures are displayed for the correct positions. Restarting the tire pressure monitor When you restart the tire pressure monitor, all existing warning messages are deleted and the warning lamps go out. The monitor uses the cur- rently set tire pressures as the reference values for monitoring. In most cases, the tire pressure monitor will automatically detect the new refer- ence values after you have changed the tire pressure. However, you can also define refer- ence values manually as described here. The tire pressure monitor then monitors the new tire pressure values. X Set the tire pressure to the value recommen- ded for the corresponding driving situation on the Tire and Loading Information placard on the driver's side B-pillar ( Y page 387). You can find more tire pressure values for various operating conditions in the tire pres- sure table inside the fuel filler flap ( Y page 387). X Make sure that the tire pressure is correct on all four wheels. 392 Tire pressure Whee ls an d tires |