DavidSC Posted September 15, 2008 Share Posted September 15, 2008 Has anyone heard about or experienced this kind of problem before? I've head through word of mouth this might be a touchy thing particular to this model, that's expensive to resolve? Please share or point me towards any info you might have with this new owner of a very gently used & well serviced LS430... Quote Link to comment Share on other sites More sharing options...
1990LS400 Posted September 15, 2008 Share Posted September 15, 2008 I don't have a LS430 but I can tell you that there is a four page diagnostic procedure for the headlight leveling system in the repair manual set for my 2000 LS400. The diagnostic procedure requires a continuity tester, a voltmeter and an oscilloscope. On my LS400, there is supposedly a fuse ("PWR-IG") in the fuse box in the engine compartment that supports the headlight leveling system but I checked and can not find a fuse labeled that way. And there is a "height control sensor" at the front and back of the car -- these are known to occasionally go bad or get knocked loose. And the "actuators" on each headlight. And the ECU for the headlight leveling system -- supposedly behind the glove compartment on my 00 LS400. I guess the first thing to check would be that all the fuses are good -- you don't have to remove the fuses to check them. I did a search on several forums and found little information on headlight leveling system problems -- apparently the system is usually trouble free unless a car has been in a crash and improperly repaired. If you are a new owner, I would encourage you to find a good independent repair shop. I've been using the same indie Lexus/Toyota shop here in Kansas for almost ten years and the service and prices are way better than at the Lexus dealer. But I sometimes use the Lexus dealer too. These are very complex cars and many of the systems in the cars are way beyond what an untrained person can handle. A good mechanic who knows these cars can often quickly zero in on the problem and save you time and money. Quote Link to comment Share on other sites More sharing options...
Blayd Posted September 15, 2008 Share Posted September 15, 2008 Has it ever been wrecked? Quote Link to comment Share on other sites More sharing options...
DavidSC Posted September 15, 2008 Author Share Posted September 15, 2008 Has it ever been wrecked? Nope, NEVER been wrecked or damaged ever. It's ALWAYS been maintained by a Lexus Dealership. Quote Link to comment Share on other sites More sharing options...
Blayd Posted September 15, 2008 Share Posted September 15, 2008 Hm. Perhaps the ECU for the headlight system. Quote Link to comment Share on other sites More sharing options...
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