Tire Monitoring System: Description and Operation

Tire Pressure Monitoring System

Refer to the Owner's Manual.

With the help of the ABS speed sensor, the tire pressure monitoring system compares both the rolling circumference and the vibration behavior of the individual wheels. The instrument cluster display shows if there are any changes to one or more wheels. If only one wheel is affected, the location of the wheel will be indicated.

The tire pressure monitoring system is a software module in the ABS/ESP control module for detecting slow losses of pressure at a wheel. With the help of the ABS speed sensors, the TPMS compares the speed and rolling circumference of the individuals wheels. If the rolling circumference of a wheel changes, the tire pressure monitoring display indicator lamp lights up in the instrument cluster. The rolling circumference of the tire can change if:

• The tire pressure is too low.

• The tire has structural damage.

• The tire or the pressure was changed and the tire pressures were not saved.

• The vehicle is loaded on one side.

• The tires on one axle are loaded more heavily (for example when towing a trailer or driving up and down inclines).

• Snow chains are installed.

• The spare tire is installed.

• One tire per axle was changed (or if the tires were rotated from front to back or the other way around).

• The left and right wheels drive on different surfaces for an extended period of time.

Tire Pressure Monitoring Display Appearing

The tire pressure monitoring display in the instrument cluster informs the driver if the tire pressure is too low or if there is a system malfunction.

System Fault in the TPMS Display (TPMS Display +)

If the indicator lamp blinks for approximately 1 minute after switching the ignition on and then stays on continuously, there is a system malfunction. "TPMS" is also displayed in the instrument cluster.

A system malfunction is stored in the ABS/ESP control module and indicated by the yellow TPMS lamp in the instrument cluster. The TPMS lamp cannot be switched off by pressing the multimedia system control head (E380) button. Proceed as follows if there is a fault stored in the Diagnostic Trouble Code (DTC) memory:

- Connect the vehicle diagnosis tester and select "Guided Fault Finding".

- Select the corresponding program in "Guided Functions".

- Now follow the instructions on the screen.

Perform Calibration: (readapt tire pressure)

The tire pressures must be stored in the MMI each time there is a change in the tire pressure or after a tire has been changed.

- Turn the ignition on, select the "CAR" function button and select the tire pressure monitoring system using the rotary switch on the multimedia system control head knob and save the tire pressure by pressing the rotary knob.