2 Volvo XC90 AWD Differencial Electronic Module .DEM. This $325 is special promotional Price,with this **Coupon Number 8** , expires June 30,2012 ,regular price is $425 how can I offer this good price? , my 25 years of highly specialized in Electrical system and PLC diagnostic, makes it possible to offer this service. Volvo Differencial Electronic Module, DEM. Halex, For 2001 to 2010 Model XC90 AWD Part Numbers