My heater control panel is displaying the fault code E5. I have checked and this relates to the heater control valve motor. I have removed the front compartment lining and have gained access to the heater control system. When operating the heater control temperature on the control panel (before it locks out and displays E5) the motor doesn't respond to any temperature that I dial in to the control panel. I have check the wiring plug that is attached to the motor and none of the wiring light up my test light. Is anybody able to tell me how to check the wiring for this component or which terminals to connect a live and negative feed to see if the motor will operate? Has anybody else experienced this problem and if so, what remedial action cured the fault? I have plugged another heater control panel in to my car and it is still the same, thus eliminating a panel fault. I look forward to some suggestions !