Hi guys I need some help here. Recently I've been having trouble with my HU in my Prius Gen 3 - it wouldn't start after car started. I took the HU out and found the HU was fine. After days of investigating, I finally found the 10 pin connector for ACC/BAT/GND wasn't giving BATT output on Pin 1. I searched the wiring diagram and found it's supposed to connect to L85 Junction connector. But where is that L85 junction connector? Also I'm not sure if L85 is the culprit. Is there anything else I should be checking?
If you have the Toyota Electrical Wiring Diagram (more info), look under Location & Routing > Instrument Panel > Position of Parts (RHD). On right-hand drive cars, L85 is on the left side, towards the top of the instrument panel, near a group of wire-to-wire connections between the engine and instrument panel wire harnesses. Aside from the 15A RAD NO.1 fuse, as @bisco kindly suggests, you may have noticed in the diagram that the circuit also goes through wire-to-wire connector AL4, terminal 7. If the fuse is OK, the trouble could be there, in one of the three sections of wire, in the connector at the head unit itself, or in the engine room junction block.
