Hi Kev,
Check the voltages on the 4 pin connector you should have:
0 volts on two pins (supply and wire brake check)
5 volts (supply)
about 2.5 volts (output which should increase or decrease when you move the steering wheel)
If the output voltage is too high or too low (at the connector not the middle pin of the black hall effect sensor) then its probably the card on the steering column if the output voltage is OK then its probably the steer controller
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