This is what I found so far, it seems you can get access for $19.95 per year. I have use this type of subscription access before and it seems to work OK and the info was what I needed. I just bought my 2008 RX350 so I have not subscribed to this service yet, but it's on my list when I need to start digging into the repairs needed. Let me know if it helps.. I will do the same...
Factory-Authorized Online 2008 Lexus RX350 Repair Manual
Detailed instructions, illustrations, wiring schematics, diagnostic codes & more for your 2008 Lexus RX350