Seat belt reminder
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
There is a lamp in the upper electronic module (UEM) for the front seat belt reminder. The sensors for the seat belt reminder are in the seat belt buckles. The upper electronic module (UEM) receives information from the supplemental restraint system module (SRS). This information indicates where the seat belt buckle is engaged and whether there is someone in the seat. If someone is in one of the front seats and the seat belt buckle is engaged, the seat belt reminder lamp goes out.