Thanks for getting back to me, you were offline when I responded earlier.
Test the motor, using a 9 volt battery - attach a wire to positive and negative side then touch the wires of the motor- let it run til it stops and then switch the wires around and let it run the other way. If it works both ways the motor is good.
Next, test the harness for continuity from the console to the motor. You will need to use a volt meter to check the continuity. If the wires check ok you will need to check the voltage being supplied by the console through the wires when the resistance buttons are pressed - it should be approx 6 volts. If there is no voltage the console is defective and will need to be replaced.
Let me know how you get on...
Ok, let me know if you find any problems with the wiring..