Sounds like an XU3 Sandman to me, but door switches aren't part of HJ Sandman - they have just been optioned. The wiper dwell was standard on almost all V8 HJ from 3/76 onwards, also on some 6cyl combinations. It became an option in HX using a separate patch harness but in HJ it was part of the main harness so they made it standard for some build configurations.