I'm not around my Pioneer at the moment, but I had intended on installing some reverse lights. Does anyone know off hand what I can tap into so I get power to the lights when in reverse? Looking for wiring diagrams now. Thanks.
Find the sub transmission gear position switch wires under your seat.
5 wires - White, Light Blue, Light Green, Gray, and Blue-Red.
They are all ground triggers.
Gray is the reverse ground trigger.
Tap this and use it as your trigger for a relay.
Then... Lights will come on when in reverse.
Run it through a switch if you like for the daytime.
0r.. For small power draw lights.
@Springer's method will work just the same.