astra g van rear wiper problem?

relay changes over, but no live output, no permanent live for wiper park, tested motor and it works fine, fuse OK does the 12v on the live side of the normally open contacts on the relay come from somewhere else, same for the permanent supply is it fed from elsewhere, fuse and relay work fine, problem is with the 12v supply to the normally open contacts on the rear wiper relay and the permanent live supply