Running gear, axles, steering

Tyre pressure monitor

~2min read

System description – Tyre Pressure Monitoring System

General notes:

The tyre pressure monitor display system is part of the software in the ABS control unit -J104-. The system is used to detect slow tyre pressure loss from a wheel. Event memory entries for the tyre pressure monitor display are stored in the ABS control unit -J104-. The tyre pressure monitor display compares the wheel speeds and consequently the rolling circumferences of the individual wheels with the help of the ABS speed sensors. After the following work or modifications, the tyre pressure monitor display button -E492- must be pressed and held until a confirmation is sounded.

Change in tyre pressures

Changing one or more wheels

Interchanging wheels, e.g. from front to rear

Removing and fitting one or more wheels

A change in a wheel's rolling circumference will be indicated by the tyre pressure monitor warning lamp -K220- lighting up in the dash panel insert. A tyre's rolling circumference may change as a result of:

Insufficient tyre inflation pressure.

Structural tyre damage.

One-sided loading of vehicle

Increased load on one axle, e.g. due to towing a trailer

Use of snow chains.

Temporary spare wheel installed

Wheel renewal

System fault in the ABS system

If a fault in the ABS is displayed by the ESP and TCS warning lamp -K155- then the Tyre Pressure Monitoring System warning lamp -K220- will also light up. However, no fault will be stored in the system for the tyre monitor display. The warning lamp cannot be erased. In this case, please carry out the following steps:
  • Connect → Vehicle diagnostic tester and select “Guided Fault Finding” → Vehicle diagnostic tester.

Follow instructions on screen to perform basic setting.

Carrying out basic setting of Infotainment system

  • Switch on ignition.
  • Switch on Infotainment system.
  • Press Infotainment button CAR.
  • Press function button Setup.
  • Press function button Tyres.
  • Press function button Set.
  • Press function button Confirm.
System description – Tyre Pressure Monitoring System

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