Anyone here a tech for VW/Mercedes vans?

[Rockatansky]

We have a '61 plate VW Crafter at work with a bit of an annoying fault - quite often the wipers and indicators just don't work.

Applying what I pass off as logic I've come to the conclusion that the steering wheel module is misbehaving in some way as, when the fault exists, nothing on the steering column works at all - indicators, wipers, horn, flash main beam.

I've found one thread online (about a MB Sprinter) which describes the very same symptoms and details the eventual fix as "a faulty terminal 15 relay which was intermittently not giving 12 volts to the steering module".

This makes sense to me but I have no idea where this relay is, if I knew then I would replace it myself.

I ask for help on here as it's been in to the VW dealer and they've not been as useful as they could be, I'm hoping someone here maybe has access to technical service bulletins or something else that could either help me fix this myself or point the dealer in the right direction.

[Rockatansky]

[Ozzie Osmond]

These problems can be caused by a multi-pin connector not quite mating properly, either dirctly into a component of where there's a line connector in the loom. I've come across similar intermittent electrical issues on vehicles where people grab the steering wheel to help them get into the van - repeated slight movement of the steering column can move the electrical connectors.