Home >> Volvo >> 2012 >> XC90 Base, AWD >> Repair and Diagnosis (Single Page) >> Drivelines & Axles >> Axle Shafts >> Active On Demand Coupling (AOC) And Differential Electronic Module (DEM) - Design And Function >> Differential Electronic Module (DEM) (Aw50/51 AWD; 2005-2007) >> Diagnostic Functions