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Hi, I think he is talking about the nav head unit. I bought recently a 2006 (early) RX400H with gen4 nav head unit. I also bought a gen5 unit. For the Gen4 a 28 pin connector is used, but the gen5 unit requires a 40 pin connector. So that wont work without wiring harness changes. I could not find any info yet about how to connect the two connector's wires to each other. I've found something about the 28 pin, what pin is responsible for what functionality, but in order to make the changes I would need to have the same functional description for each pin for the 40 pin connector.