The factory manual has a flowchart. Here is the plain English version.
There is for the AVIC-RZ500. Pioneer explicitly states that the device is sold for the Japanese market only, and the official documentation is strictly in Japanese. Language Support Reality Pioneer Carrozzeria Avic-rz500 English Manual BETTER
If you have searched Google, Reddit, or the Carrozzeria Facebook groups, you have likely downloaded a PDF that is 20 pages long, pixelated, and clearly translated by Google Translate in 2007. These "manuals" fail to explain: The factory manual has a flowchart
Today, we are discussing the "BETTER" solution. The search for the has been a long, frustrating road. Here is why finding a good one matters, what pitfalls to avoid, and how to finally master your head unit. Pioneer explicitly states that the device is sold
While the unit is locked to Japanese, you can often achieve a "partial" English interface or use translation tools to manage daily functions:
You can find the original technical drawings and Japanese manuals on the Pioneer Japan Support Page