Lexus RX 400h: Problems & Solutions - READ ONLY

202 messages, Last post on Oct 25, 2006 at 6:35 AM

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What is this discussion about? Lexus RX 400h, Hybrid Cars, SUV

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#141 of 202 Power Window on Pass and Rear don't work by lxpatel Feb 20, 2006 (6:09 pm)
RX400h the battery went dead, because the car was sitting in garage for a month, Lexus sent AAA who jump started it, next day it went dead, even after few miles with engine on. I got another jump today, but now Passenger side window and rear dont work and Also the sunroof. What is it? Fuses or Relay. Note: Also found the Snail skeleton on the battery terminal. Replies to this message: katzjamr (Feb 20, 2006 6:50 pm) lxpatel (Feb 24, 2006 11:02 pm)
#142 of 202 Re: Power Window on Pass and Rear don't work [lxpatel] by katzjamr Feb 20, 2006 (6:50 pm)
Replying to: lxpatel (Feb 20, 2006 6:09 pm) For many with these vehicles the 12V battery has been a week link. I love my 400h, however many have reported early problems with the OEM battery. Once it goes completely dead it may never be reliable. I would have it checked for the ablility to hold a charge and its general health. Have the dealer replace it if its questionable. Also more importantly any time your 12V battery goes dead make sure the dealer reprograms your 400h. You may notice lower than average gas mileage until this is done. Believe it or not non functioning items like the sunroof and the windows are a symptom of a bad battery in this lexus. Replies to this message: lxpatel (Feb 24, 2006 11:02 pm)
#143 of 202 Re: Power Window on Pass and Rear don't work [katzjamr] by lxpatel Feb 24, 2006 (11:02 pm)
Replying to: katzjamr (Feb 20, 2006 6:50 pm) Thank You, I have not noticed any changes in Mileage, but all the radio presets and Avg MPG in the energy menu have been resetted. Do you really think it needs to be reprogrammed? And if so what do they reprogram?
#145 of 202 Re: RX400h Cruise Control Problems [dale11] by kjoeb Feb 25, 2006 (8:33 pm)
Replying to: dale11 (Feb 13, 2006 2:28 pm) Interestingly enough, my 06 cruise works great on the hills on I44 in SW Missouri. MPG is poor to say the least, but the cruise is good. Strange Lexus is saying that is functioning as designed (FAD). I don't think there is an engineer anywhere that would do that on purpose.
#146 of 202 press request by kirstie_h HOST Feb 27, 2006 (12:43 pm)
A major national newspaper would like to interview those who recently purchased a new Mercedes ML or a Lexus RX/400H. Please respond to jfallonedmunds.com before Wednesday, March 1, 2006 with your daytime contact info and a few words about the model you chose.
#147 of 202 Any one know Battery CCA on the Factory RX 400h by lxpatel Feb 28, 2006 (3:25 pm)
I just had the Auxiliary battery replaced at the dealer, they put 84 month 500 Cold Cranking Amp battery, i wanted to find out what CCA came from the factory if any one has a RX 400h that has not had the Auxiliary battery replaced by the dealer. Replies to this message: wwest (Feb 28, 2006 4:24 pm)
#148 of 202 Re: Any one know Battery CCA on the Factory RX 400h [lxpatel] by wwest Feb 28, 2006 (4:24 pm)
Replying to: lxpatel (Feb 28, 2006 3:25 pm) You may have made a mistake, a big one. The 12 volt battery in your RX400 is kept charged via a voltage downconverter/inverter from the hybrid battery. Too much battery loading, battery too big, might destroy the downconverter.
#149 of 202 Any one know Battery CCA on the Factory RX 400h [lxpatel by lxpatel Feb 28, 2006 (11:13 pm)
Well, Lexus installed the battery, and 8 yr warranty plus Lexus extended warranty to 100k, hope fully downconverter is covered item. One other note. They did reprogram something which made the rear power windows work from the driver's door switch as well as the roof which started to function properly