Car wiring diagrams: Wiring Diagram Bmw Z4, wiring diagram, wire wiring harness, schematic circuit diagram, wiring diagran, wireing diagram, wirring diagram, wiring daigram, wiring diagrams. Hi guys can anybody tell me where I can access a wiring diagram for my cc, I cannot get the speedo to work, I have changed the speedo . . ! .Key to cruise control system wiring diagram picture . Plug connection centre section to instrument cluster pin . Steering column switch.