My 03 CTR EP3 heater motor has stopped working. A brief internet search indicates this could be due to the resistor pack used to drop the fan speed or the motor itself or I guess the supply to it via the switch/fuse. I haven't been able to find a circuit or wiring diagram to help me fault find. I would like to understand the circuit so I can identify exactly which of these components needs replacing. I am guessing the resistor pack but it would be nice to know for sure before going and finding a new one. Would any one have a circuit diagram they could send to me please? Or any knowledge on how to fault find this circuit. Also I couldn't identify which fuse in the fuse box in the engine bay supplies the fan, it isn't obvious from the pictures printed on the lid. I did check every one in there except for the big square things that all seem to be open circuit (what are these?). Which one is it do yo know? I assume it isn't the fuse anyway as they are all good.
Thanks for any help.