Tire pressure warning reset procedure


Applies to: Smart fortwo BR451. Model Years 2008, 2009_


The tire pressure monitoring system (TPM, RDK) monitors air pressure in individual tires improving active safety.
TPM system utilizes a previously stored tire pressure as a comparative value. If a loss of pressure occurs, the tire pressure monitor warning lamp in the instrument cluster warns the driver. This lamp indicates a pressure loss and does not specify which tire. Check all four tires if lamp illuminates.

The tire pressure measuring range is p = 0 to 78 psi (p = 0 to 5.5 bar).

The TPM system can be reset via the TPM button on the instrument panel. When the TPM button is pressed, the current tire pressure is stored in the memory of the TPM control unit and is then used as the reference pressure, as long as it is within the permissible limits.

The tire pressure monitor warning lamp in the instrument cluster flashes to indicate that a manual restart has taken place.

Perform a manual reset each time the tire inflation pressure is changed and when a wheel, wheel sensor or the TPM control unit is replaced. If the nut on the valve element of a wheel sensor is loosened, replace all seals and fasteners.

Before Performing any Work

Please read Warnings & Cautions before proceeding with any work on your vehicle