neidermeyer

Crutchfield is a great source for install info.

I gave the link to the fob programming instructions ... the fobs for Lexus ARE NOT SECURE , the only secure electronic keys/fobs are 2003+ Mercedes Benz , all others are basically operating on the same technology level as your garage door transmitter.. you can certainly program your own new fob it's not difficult... I can get a metal Lexus key cut for about $15 if I have the blank and there is no question about the car being registered to you ,, so yes $250 does seem excessive to me.

The discoloration is on the outside ,, the lenses are made of polycarbonate (same stuff as your 2liter bottles and sunglass lenses) .. in fact polycarbonate blocks 99%+ of the UV light... Most Toyota's and Lexus' headlights are very easy to clean up as they don't generally have bumps and protrusions... You can buy new ones as there are many aftermarket replacements (usually sold as crash parts to body shops) but you can get excellent results in about 30 minutes... here's how..

Determine how bad the lenses are...

Wet sand if necessary with 800 (stop when yellow ends and white begins) then 1200 and finally 1500 grit wet-or-dry ... RINSE

Using your polisher on low speed buff the lenses with Meguiers "Blue Magic" Plastic Polish or equivalent on a terry pad... (high speeds may burn the plastic)

If available spray with a clearcoat paint to stop oxidation of the newly polished finish.

I'd polish them ,, replacements seem to be $100+ a side and changing them takes quite a bit of time.  http://www.partsgeek.com/658skgr-lexus-rx330-headlight-assembly.html?utm_source=shoppingcom&utm_medium=pf&utm_content=ac&utm_campaign=PartsGeek+ShoppingCom&fp=pp&utm_term=Lexus+Headlight+Assembly

Maseace ,

Is the RX400h "friendly" for the BlueTooth ELM327 OBD2 interfaces so you can run "Torque" or similar?  I have a Camry that must encode the data in a non-standard way so usefulness is limited there..

Lexus keys can be cut by most locksmiths.  The keyfobs transmitters can be bought on eBay for about $25 each with a blank key ,, I bought the folding style myself recently.. as long as you have a key and a working fob there is just the "dance" to get the system to register a new fob ... http://freeremoteinstructions.com/lexus/lexus-rx330-2004-2006/