I have a 2004 Lexus RX330. I heard a loud rattle under the hood and then it sounded like something came undone and when I drove off the power steering was out and the battery light was on. ideas ?

SOURCE: lost power steering and brakes

probably need a new pump since it powers the steering and the hydroboost assist for the brakes

SOURCE: 2004 Lexus RX330 Battery Replacement

You just had to disconnect the negative off the old battery first. Then you disconnect the positive and it happens to touch metal it won't short anything out. Make sure you can not wiggle the cables, that the connectors at the battery can't spin or move at all. Tighten them more if necessary, try to start it. Let me know if you still have problems.

SOURCE: 2000 Lexus ES300 - 45K

Are you sure this is a rattle or is it more of a creaking noise? I have a 2000 ES300 and had an issue when I would go over speed bumps and the noise would drive me nuts! However replacing the bushing in the top of the strut mount is expensive due to the labor involved.. Replacement of the strut or the bushing isn't necessary. Just open the hood, locate the strut housing and you ll be able to see the black rubber bushing in the middle. Obtain a can of Heavy Duty silicone aerosol spray and attach a straw to the spray tip. Using a flathead screwdriver wedge the screwdriver between the top of the bushing and the metal pushing the screwdriver all the way to the edge of the metal underneath the roof of the metal housing. Then pry the edge of the bushing away from the metal housing so that the top of the edge of the bushing exposed and stick the straw end of the silicone into the spot and spray generously. Only slight bushing movement will be obtained as the bushing is pretty stiff but it will be enough. Work your way around using this technique until you get the spray fully around the bushing 360 degrees getting it into the area between the edge of the bushing and the metal. Then spray the silicone onto the top of the bushing filling it all the way up until it spills over the metal. After it drains down, repeat again making sure you fill it above the rim of the bushing so it seeps into the area between the bushing and he metal housing (or frame) because this is where the rubbing is taking place that is creating that awful noise. Repeat on the other side and your done. The main goal is to get the silicone into the area between the metal and the bushing along the edge. This happens to be the way I was able to do it. This totally solved my problem and now the car is so quiet there aren't any knocking, creaking or rattling noises. This was a hard solution to explain without visuals, hope you can follow. This will work for sure. The Heavy Duty Silicone spray I used was manufactured by CRC and I bought it from Walmart.

SOURCE: Cracked screen on 2004 lexus rx330 nav unit

I know there are aftermarket units but you will spend at least $1000 to get one.
However there is an all new RX for 2010, so, as the demand drops off for 2004-2009 accessories, the prices should begin to drop. I have also seen entire RX 330-350 units on ebay while searching for parts for my 2001 RX300.
I do know this is major work as I have seen the techs install an XM kit, ipod jacks and a rear DVD player as well.
They take out half the dash..... It is not a fast fix so at $100 an hour at the dealer, maybe a new aftermarket unit with far better resolution would be your best value.The 2004-2005 RX NAV was a bit grainy for my liking.......

SOURCE: 2004 lexus rx330 what does vsc light indicate

VSC is Vehicle Stability Control. This is and electronic sensing which monitors and combines performance of braking, wheel slippage and handling, ect.
If this light comes on along with check engine light, it can be caused by a loose gas cap or faulty o2 sensor.