When a tire is under-inflated, its diameter (and consequently also its rotational speed) changes. By comparing the individual tires with each other it is possible to determine if one or more tires are under inflated.
When low inflation pressure is detected or if the system is not functioning properly, Tire Monitor will light up the tire pressure warning light (
) (also referred to as a telltale) in the instrument panel and will display one of the following messages in the text window, for example: Tire pressure low Check rear right tire1 or Tire press. syst Service required.
If the system cannot determine which tire has low pressure, a general text (Tire pressure low Check tires) will be displayed.
Note
If a malfunction occurs in the system, the tire pressure warning light will flash for approximately 1 minute and then remain illuminated. Tire press. syst Service required will be displayed.
Note
The system indicates low tire pressure but does not replace normal tire maintenance. For information on correct tire pressure, please refer to the tire inflation pressure table (see Tire inflation – pressure table), the tire inflation pressure placard located on the driver's side B-pillar (the structural member at the side of the vehicle, at the rear of the driver's door opening) or consult your Volvo retailer.