Volvo XC90 - Manual (Page 197)

07 Wheels and tires
Tire Pressure Monitoring System (TPMS)
07
197
Activating/deactivating TPMS (Canadian
models only)
1. Switch off the engine.
2. Turn the ignition key to position I or II.
3. Press and hold the Reset button on the
left-side steering wheel lever until
TIRE
PRESS SYST OFF is displayed.
Repeat steps 1-3 to turn TPMS on again.