Tire Pressure Monitor System Restart

The TPMS button in the cockpit switch panel is used to reactivate the TPM system. When the TPMS button is pressed the current tire pressure, as long as it is within permissible limits, is stored in the internal memory of the TPM [RDK] control unit and used as a reference pressure.

1. Adjust the tire inflation pressure recommended for the vehicle operating condition using the tire and loading information placard on the driver's B-pillar.
   NOTE: The tire pressure should only be adjusted on cold tires.
2. Press the TPMS Restart button. See Fig 1.
3. Observe the combination low tire pressure/TPMS malfunction telltale in the instrument cluster. The light should flash for approximately 5 seconds and then go out.
4. Drive the vehicle a few minutes to allow the system to verify that the current tire inflation pressures are within the system's specified range. Afterwards the current tire inflation pressures are accepted as reference pressures and then monitored.

Fig 1: TPMS Restart Button

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.