Thanks kamold, I have checked the new unit fuse (all good) and reinstalled the old unit as it was getting late, and the new unit works fine so power is being supplied to the interface cable at least.
I wrote to the supplier and they said I needed a can bus decoder in order to turn it on, if that's the case I'm a bit annoyed as that wasn't mentioned on the listing - it was only referenced in the context of gaining control through the steering wheel.
Do I need a decoder for it to turn on????
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