Change the reference value by recalibrating the system, such as for driving with a heavy load, for example.
For high-speed driving (above 160km/h (100 mph)) the tyre pressure should be adjusted in accordance with Volvo's recommended tyre pressure values.
TPMS adjusts the reference value automatically at this speed. For the system to operate correctly, recalibration must not be performed.
The new reference values apply until steps 1-5 are carried out again.