Since the original paper manual is in Japanese, here is the best available resource—the for the Avic-HRZ09. While service manuals are technical, they often contain the operational specs and wiring diagrams necessary for installation and troubleshooting.
Despite the language hurdles, the unit remains popular for its high-quality hardware: Pioneer Carrozzeria Avic-hrz099 English Manual
“While navigating a route, the AVIC-HRZ099 allows you to maintain turn-by-turn directions on a dedicated portion of the screen (left or top 1/3), while simultaneously controlling or viewing a secondary media source on the main area. For example, you can browse a DVD chapter list, search an iPod library, or view an rear-seat entertainment video without losing navigation guidance. A persistent arrow and distance countdown remain visible, and voice prompts continue uninterrupted.” Since the original paper manual is in Japanese,
Since you don’t have a manual, here is the cheat sheet for the physical buttons and basic recovery: For example, you can browse a DVD chapter
Here is your workaround:
For general navigation, follow these common button layouts often found on Carrozzeria units: