Completeted a turn from off ramp and driving straight with a speed of approximately 35 miles per hour when vehicle lost steering control and braking power. inputs to the steering and braking had no effect on changing vehicle course and/or speed. the vehicle subsequently impacted a guard rail and was then hit by a semi truck. none of the air bags in the vehicle deployed. road conditions were dry and the accident occured during the afternoon. injuires to myself included a 2 inch laceration to the top of my head treated with staples, a broken left clavicle, fractured left ribs, and facial bruising. i was trapped in the vehicle because both doors could not be opened because they were jammed by impact forces. i had jaguar's main customer service contacted requesting an engineerng investigation but was told that it is not supported and was deferred to my insurance company. *nm