Russian modders have created a language patch that replaces 90% of the Japanese text with English. It requires burning a firmware CD. Search for "AVIC-VH009 English Firmware Patch" on JDM forums. The included PDF with that patch is the closest thing to an English manual on the internet.

? Upload a photo of the screen, and I can help translate the specific Japanese text for you! How do i change language on avic-hrz08 - JustAnswer

Pioneer Carrozzeria AVIC-VH009 is a legacy high-end multimedia navigation unit originally released for the Japanese Domestic Market (JDM). Because it was engineered specifically for Japan, a formal English manual does not exist, and the internal software is almost entirely locked in Japanese. MiniDisc Wiki The Language Barrier Unlike newer global Pioneer models, the AVIC-VH009

Some models allow you to change the voice guidance or specific system labels to English via the Settings (設定) > System (システム) menu.

The Pioneer Carrozzeria Avic-vh009 English manual is a comprehensive guide that covers all aspects of the device. Here are some of the key topics covered: