Well after a looong search it seems there is a EPDM (Electronic Power Distribution Module) hidden in behind/beside the battery that controls the "high current" systems and has the relays/fuses for the headlights ( and other stuff )

This system is CAN controlled so its a smart fusebox but doesn't seem to be well known. Given the fact that i want to do a headlight wattage upgrade i will check the relays etc very carefully as this EPDM is probably verrrrry expensive if it gets stuffed.

Still have to investigate the wiring etc.

 

Seems quite a bit of the Z electronics is controlled by the CAN bus system. If you want to know more about CAN goto http://www.can.bosch.com/

It gets a bit heavy in spots but might explain some of the mysteries.