I was joking. But thanks for the link anyway.
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You wouldn't believe it. Used car again and the up and down functions have stopped working again.
Plugged Nanocom in again and I found this.Attachment 190824
The screen at the top which is blank in this photo mystically had numbers in it.
So I wrote the same number into the bottom screen and saved.
Voila, everything now works.:banana::banana::banana:
Simpson Desert here I come.
Link added to Electronic Diagnostic Systems Forum