there might be a relay for headlights in cab on n/s above wheel arch, also i think there is a unit for dim/dip in cab ,remove ashtray for access to it[ possibly pink in colour.], you need to check if there is a feed to heater motor multi plug connector under dash n/s ,remove glovebox for access.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix vans.