Help Please on the following Items, I have purchased a Owner's Manual, but these items are not covered. 1) Is there a seperate fuse for the Nav Screen and DVD Player. I have checked all fuses in the cab and bonnet. The screen does not light up, the DVD player will not accept a disc 2) there is a small push button on the trim panel under the steering whiil to the right, marked Auto 1. What is the function of this button ?