Wire from ECU to SATNAV DVD Unit

[MickDoev Lurker Find all posts View Profile Close MickDoev]

Hello,

I am looking to replace the factory Radio/Satnav from my 120 with a new unit that has Bluetooth/reverse camera and other fun stuff.

In the process of tracking the wiring loom that runs between the existing head unit (Fujitsu Ten 08600-00969) and the SatNav DVD unit under the drivers seat, I discovered two additional wires. One wire runs run from the SatNav DVD unit to the passenger side ECU (identified as Denso 89661-6A320). The other wire runs to a relay just below the ECU.
Any ideas as to what these wires are for ?

The SatNav DVD is a denso unit and has the following markings;
86841-33070
462100-0614

A wiring spec on this unit would solve the riddle . . .

Thanks.