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Tire Pressure Monitor System Reactivation

CAUTION: The warning system can only operate in a reliable manner if correct tire pressures are set. If an incorrect tire inflation pressure is set, the system will monitor the pressure according to the incorrect value.
NOTE: Tire pressure should only be adjusted on cold tires. Observe the recommended tire inflation pressure on the placard on the driver's door "B" pillar (some models may have supplemental inflation information on the fuel filler flap).
  1. Turn ignition switch to OFF position.
  2. Ensure inflation pressure of all 4 tires is set to specification.
  3. Turn ignition switch to ON position (engine may be on or off). The standard display menu will appear in multifunction display on instrument cluster (shows information such as outside temperature, and trip and main odometers).
  4. Press menu scroll forward or back button (located on left side of multifunction steering wheel) until TPM system menu is displayed.
  5. Press the up or down button (located on left side of multifunction steering wheel) repeatedly until multifunction display reads "TIRE PRESSURE MONITOR ACTIVE. REACTIVATION POSSIBLE: R-BUTTON" or "TIRE PRESSURE MONITOR ACTIVE. MENU: R-BUTTON".
  6. Press reset button on instrument cluster. See Fig 1. The multifunction display should now read "RESTART TIRE PRESSURE MONITOR?".
  7. Press the "+" button (located on right side of multifunction steering wheel). The multifunction display will now read "TIRE PRESSURE MONITOR RESTARTED" or "TIRE PRESSURE MONITOR REACTIVATED" confirming TPM system is activated.
    NOTE: To cancel activation process, press "-" button.
  8. After driving a few minutes, the system verifies 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.
  9. Fig 1: Locating Reset Button On Instrument Cluster
    G00251675Courtesy of MERCEDES-BENZ OF NORTH AMERICA.