Attach the included calibration microphone to the center of the driver's seat headrest at ear level.

While the Japanese Carrozzeria unit has Japanese physical buttons, the internal setup menus can be set to English, according to community user experience.

Ultimate Guide to the Pioneer DEH-P01: Owner’s Manual, Features, and Setup

📄 Need the Pioneer DEH-P01 Manual? (Download or Key Info)

The Pioneer DEH-P01 is a masterpiece of early 2000s engineering. It sounds better than 90% of modern $100 Bluetooth receivers because of its high-quality Burr-Brown DACs and robust preamp section. But it is not intuitive by 2025 standards.

A detailed manual for wiring and mounting can be found on Scribd . DEH-P01 (DEX-P99RS) Review | Page 3 - DIY Mobile Audio