I have one of your unite installed in my car. It has stopped working and the dealer that installed it has gone out of business. I checked others shown as local dealers but no one will look at it. I have the User Guide for the AS-1755v but I need the wiring schematics so I can trouble shoot it myself. It is probably something simple but without the wiring diagram I do not know where to start. Could I get an electronic copy of the wiring diagram for the AS-1755v?