Can anyone help me, I am new to this forum. I have a W129 2000 SL 320. I have had a new alarm fitted to my car. When I got the car back the fan control is displaying but is frozen, none of the buttons are working. My local Merc specialist has looked at it and tried a new control panel which did the same. He has told me he will now need to start tracing the wires back to see if somthing has been disturbed. Has anyone got any ideas