This must be connected to the power side of the parking brake switch for safety features to function. Speaker Wire Color Codes
This is not a simple 12V output. The schematic shows two modes: pioneer avic-x9310bt wiring diagram
The speaker connections are grouped into four pairs, with a solid color for positive (+) and a black-striped version of the same color for negative (-). Positive (+) Negative (-) White/Black Front Right Gray/Black Rear Left Green/Black Rear Right Purple/Black Advanced Connectivity: 32-Pin RCA Harness This must be connected to the power side
Although part of the system, these are not covered by a standard "wiring diagram" because they use coaxial and 3.5mm jacks: Positive (+) Negative (-) White/Black Front Right Gray/Black
The diagram reveals a configuration for speakers, but with nuanced warnings.
The legendary "P brake wire." The schematic reveals a dual-stage logic circuit: