Please be more specific.
what is it not doing
Rear wheel drive or four wheel drive.
No. A "all wheel drive" is all the time four wheel drive. A 4x4 or 4-wheel drive can be set to drive in two wheel drive or four wheel drive.
The 2011 X5-M is not a front wheel drive or a four wheel drive. It is an all wheel drive.
The 2004 Jeep Wrangler has four wheel drive.
The 2012 Porsche Cayenne has four wheel drive.
The 2001 Jeep Wrangler has four wheel drive.
The 2010 Honda Ridgeline has four wheel drive.
The 2003 Jeep Wrangler has four wheel drive.
The 2011 Volkswagen Touareg has four wheel drive.
The 2007 Jeep Wrangler has four wheel drive.
The 2002 Jeep Wrangler has four wheel drive.