Towbar Electrics

Presumably you’ve checked the fuses for your van seen as though the car test seemed to show the tow electrics were working? Another possibility is if you know anyone with a van who would be willing to let you plug their van into your tow bar electrics, then you’d know for certain where the fault lay to give you a starting point?

Maybe if your caravan has LED cluster lights the Volvo electrics are not compatible as it stands, and you need a loading module.

Thanks for the replies, I am fairly new to caravanning so will check the fuses on the van then look at a module if required, any idea how much a module costs??

I would go back to Volvo and see what they have to say about it, they should be willing to make it work with your van, they charge enough !

We had a 2007 XC90 with a 1998 van, no problem.  Then we changed to a 2008 caravan, again no problem.

Now we have a 2016 VW with the 2008 caravan, still no problem.  

One thing I would say is that trying the car with a tester board is not the same as trying it with an actual caravan.

Take the caravan along and tell them to make it work.  That is  what you have paid them for.

Are you getting any messages / feedback from the trailer lights self test function in the car?

I know when I last changed my car to the D5, all of the lights stopped working. I had however updated to LED lamps - I put a filament lamp back on each circuit and they all worked fine - nots sure if you are able to do that id you think they are LED as Metheven suggests.

Another test would be to borrow a trailer board from someone, or by one from Halford's online (the robbing scumbags) and then return it for a refund, to test. 

With the Volvo XC60 there is a check trailers lamps function XC 60 Check Trailer Lamps.   This should initialise the system and/or identify the problem.  Otherwise, as said above go back to the Volvo agent for them to fix it.