Pins 9 and 10 were checked and working when the towbar was fitted. It was a new Volvo cable harness and trailer module and the software update was done by my local Volvo dealer. I also had checked, in particular, pin 10 as I was expecting it to only go live once the engine was running but it was live as soon as the ignition was switched on. But that's another saga!
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Simon J
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