Pioneer AVH-P7800DVD Manuel D'installation page 7

Yellow/black
If you use an equipment with Mute function, wire
this lead to the Audio Mute lead on that equipment.
If not, keep the Audio Mute lead free of any
connections.
This product
Fuse (7.5 A)
Fuse resistor
Fuse resistor
Power supply box
(supplied)
Fig. 3
6