System function: Notes
WARNING: This page is about a different car, the 2009 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
Courtesy of SAAB-SCANIA OF AMERICA, INC.
The primary function of the XWD control module is to regulate the torque delivered to the rear wheels. The torque is regulated by means of applying a disc clutch hydraulically.