fabphil

Yes I have checked the line from the battery going to the alternator, and I measured the current through a 22ohm resistance waiting the tension to stabilize. Yes, you are right, this is a king of thing which needs patience. Meanwhile I just disconnect the battery and I have a spare battery in the trunk !

I got also a leaking battery and I suspect the Body Ecu. I think that the best way to get rid of these malfunctions is to spend much time with the electrical documentation, or to be lucky, but this doc is not that easy to deal with. There is also a diagnostic manual that you can find here http://www.ls400.ru/lexus-89-2000/ ?

I reopen this topic because the battery of my LS400 98 gets discharged if I don't run the car for about 10 days. I measured the drain about 0.4V (7 V through 22 Ohm) which is a lot (10Ah/day, 100Ah/10days ok). I tried to locate the draw by removing each (small) fuse one after the other -> no success. I have also disconnect without success one after the other the cable connections of the fusible Link Block close to Engine Room J/B.. As far understand the Body Ecu circuit is the only suspect which remains and indeed it is active when switched off. So the next test is to disconnect the Body Ecu. Hmm, it is located behind the Instrument Panel J/B (left foot driver). I would appreciate your feed back: Is that ecu easy to remove?, Have you experienced such a drain?. Behind this issue, every system of this car works alright. I have cleared the the side of the butterfly throttle, I did not replace the throttle gasket because the one I bought from Lexus was not the good one (no much play to take this throttle body out). I have checked the spark plug. They are Denso Iridium, probably genuine from the factory (the car is 150 mkm), with the gap still at 1.1 mm. Replacement is to be done at 150mkm or when the gap is 1.2mm.

Hello everybody, I just drived from Italy to Paris this lexus ls 400: http://annunci.ebay.it/annunci/auto/mantova-annunci-roverbella/lexus-ls-400/36910394 which have been waiting for me for about 2 years in a junk yard. 1000km which were ok and very relaxing as it seems as driving an American car on highways (weather was ok). The engine is beautiful but the seats are not as good as Volvo's and also there is no place for the right foot when on cruise control. Indeed I would be happy to be part of this forum. Another reason is that from my Volvo 850 experience I know that by law the makers have to allow access to all data of their vehicle to the American individual, which is not the case in Europe : knowledge is only given to patented garages. I bought the car with one key and without service book or history apart the fact that the car was seized by the police because it was not insured. Some other things are not working, may be more about that later on. Probably I would give the car to the Lexus garage for the timing belt and 90000 miles service and expertise. Although I can do some mechanics since I also own a Maserati biturbo.