GF40.15-D-0001-03HH Tire Pressure Monitor (RDK), Displaying Tire Inflation Pressure

GF40.15-D-0001-03HH Tire Pressure Monitor (RDK), Displaying Tire Inflation Pressure

The tire pressure monitor (TPM) system can be used during a journey to show the actual tire inflation pressure for each individual wheel at any given time on the display (A1p1) of the instrument cluster (A1). Minor changes in the displayed pressure during a journey may be down to fluctuating temperatures in the tire's interior air.

Display tire inflation pressure:
^ Repeatedly press the scroll forward/back button (S111s1) on the multifunction steering wheel (MFL) until the tire pressure is displayed on the instrument cluster display.
^ The current actual tire pressure in the individual tires is shown on the display. A representation of the vehicle with the tire pressure for each wheel is displayed.

System message

The system message concerning the tire pressure display may temporarily only be displayed in place of the pressure values after the vehicle has been driven for a few minutes. This is the case when an activation process was initiated, when wheel sensors (left front TPM wheel sensor (A69/1), right front TPM wheel sensor (A69/2), right rear TPM wheel sensor (A69/3), left rear TPM wheel sensor (A69/4)) were replaced or other wheels fitted. The tire pressure monitor system checks whether any changes have taken place at the wheel positions. The pressure values are not displayed until the TPM system can unambiguously assign them.

The logics of the tire pressure monitor system automatically detect through the rear tire pressure monitor antenna decoder (A2/111) and the front tire pressure monitor antenna decoder (A2/110) (up to 31.12.2010) or the TPM [RDK] control unit (N88/1) (as of 1.1.2011), the wheels with wheel sensors, which are mounted to the vehicle.

The TPM system can assign the wheel sensors to the individual positions. If the wheel positions are altered (e.g. by changing the wheels), a teach-in process is started for localization, which detects the new status. During this localization process the tire pressures are shown at the old positions. As soon as the tire pressure monitor system has recognized the location, the pressure allocation is updated. This process is only active during a journey, in order to ensure that any signals from external vehicles are not incorrectly assigned.

If the vehicle was parked for longer than 20 minutes or if the vehicle was not driven faster than 30 km/h, the tire pressure display only appears on the display after the vehicle has been driven for a few minutes.

For vehicles as of 1.1.2011, the antenna for the front wheel sensors is integrated into the TPM [RDK] control unit.