Do you have a question about the Pioneer MVH-S425BT and is the answer not in the manual?
Avoid self-installation/service and operating while driving.
Switching between network and standard speaker modes for FH-S725BT.
Connecting USB devices and AUX audio sources.
Pairing mobile devices via Bluetooth.
Connecting the unit with the Pioneer Smart Sync application.
Guidelines for speaker output, wiring, and power.
ACC position, battery connection, and wiring tips.
Cable routing, placement, and connection advice for the unit.
Wiring diagrams for power cord and subwoofer connections.
Wiring diagram for connecting an optional power amplifier.
Specific wiring diagram for FH-S725BT.
Specific wiring diagram for FH-S525BT/MVH-S425BT.
Important checks, warnings, and angle recommendations for installation.