bob194ever Posted December 19, 2002 Share Posted December 19, 2002 93 SC 400 has pulsating dash lights when the turn signal is on,hit the brakes radio quits then turns back on,spin the tires on ice (in Canada) engine shuts down,new alternator and battery,ran fine with new battery for 4 days with slight pulsating of dash lights but now problem has become more pronounced.Dealer is doing work and seem to be stumped on problem. Quote Link to comment Share on other sites More sharing options...
Supra-chargedIS340 Posted December 19, 2002 Share Posted December 19, 2002 engine earth? or possibly a bunch of earth problems Quote Link to comment Share on other sites More sharing options...
gsackett Posted February 27, 2003 Share Posted February 27, 2003 I have had similar experience with my SC300. It is very intermittent which makes it that much harder to track down. I would be interested if someone has a solution. . . . . Quote Link to comment Share on other sites More sharing options...
AWJ Posted February 27, 2003 Share Posted February 27, 2003 Check all fuses for proper seating in their holders. Clean the battery terminals. Then search for the rogue ground. It may be best to start with the item that seemed to cause the failure but that can be misleading. My previous sc300 cut out all dash power once when I hit the breaks. The fuse for the radio was blown as well as the fuse for the cigarette lighter. My car had some "custom" wiring done by the previous owner. Had to pull the aftermarket radio and found the power for it coming off of the cigarette lighter as well as power from the lighter going to a couple other components. To top it off, the ground on ciggy light was *BLEEP* poor. I had to do some rewiring but after all was done, no more problems. I can't say definitely what the cause for the two of you is without going into the car. But it is definitely a similar situation. Check all grounds easily visible first related to the accesories that were in use at the time of failure. Something is loose. A fuse or a wire. Clean any degraded connections first and foremost the battery terminals. Then circuits will have to be traced. Good luck. Quote Link to comment Share on other sites More sharing options...
Speedy01 Posted March 20, 2003 Share Posted March 20, 2003 I've checked everything that has been mentioned here. I am still experiencing a power loss whenever I use my turn signals or hit the brakes. Is this a common failure for the SC300s? Is there a recall for this? Quote Link to comment Share on other sites More sharing options...
AWJ Posted March 20, 2003 Share Posted March 20, 2003 You need to check the grounds on this circuit. They have probably corroded or loosened. Get the service manual for your car. I have one at the house but probably can not get access to it. I have a set of manuals for sale as well. If I get a chance I can try to locate the electrical schematic of that circuit. Take it to a sound shop like stereo or alarm installation and tell them when you activate the turn signal that power is lost to various auxillaries. I'm confident it is a grounding issue. Best of luck. If schematics are desired I may be able to locate some. PM me a fax number. In the future I plan to have a complete manual available. There was no recall regarding this item. As any electrical circuit ages - connections and contacts degrade. It is a fact of life. Our vehicles are heavily electronic. It kind of comes with the territory. Good trouble shooting will locate the problem. If a multimeter is used at the switch mechanism an open ground should be easily detectable. Good luck. Quote Link to comment Share on other sites More sharing options...
AWJ Posted March 27, 2003 Share Posted March 27, 2003 Did you receive the fax Speedy? Quote Link to comment Share on other sites More sharing options...
Jap Spec 300TT Posted April 3, 2003 Share Posted April 3, 2003 Ok a friend of mine had that same problem with the dash on his car and he tracked it down to an ic(integrated circuit) that was bad.... as soon as i find out exactly which ic i'll post as i have that same problem with the dash. Quote Link to comment Share on other sites More sharing options...
egmears Posted May 7, 2003 Share Posted May 7, 2003 I have had similar experience with my SC300. It is very intermittent which makes it that much harder to track down. I would be interested if someone has a solution. . . . . I have a 1995 SC300 with 116,000 miles. The electrical system dies intermintently. Sometime when I break, use the turn signal. Other times for no reason. Once the engine quit & I did a manual start while coasting in neutral. Lexus can't find the short. Any Luck ? 05/15/03 Engine ground strap being replaced.....lEXUS OF SOUTH ATLANTA IS CHARGING $135.00 FOR THE GROUND STRAP & $350.00 FOR LABOR.........$435.00. NORMALLY A GROUND STRAP WOULD BE $50.00.............lEXUS MUST MAKE THEIRS OUT OF A COPPER/PLATINUM MIX. :) A new ground strap fixed the problem. Quote Link to comment Share on other sites More sharing options...
toxdoc1947 Posted May 13, 2003 Share Posted May 13, 2003 I have a 1995 SC400 with a similar problem. I have checked grounds until I can't stand it. Lately, my battery has been down, and dealer replaced battery. No problems since - this reinforces my belief that it's a ground issue somewhere. My problem seems to be worse when the humidity is high - the very worse when I get into the car on a muggy day after working out. Quote Link to comment Share on other sites More sharing options...
AWJ Posted May 16, 2003 Share Posted May 16, 2003 Higher resistance. Check body grounds for corrosion. It's tedious I know. Don't give up - you'll find it. Good luck. Quote Link to comment Share on other sites More sharing options...
MrSypher Posted May 16, 2003 Share Posted May 16, 2003 Damn bro... You find out the problem yet?? Keep on it and goodluck.. Quote Link to comment Share on other sites More sharing options...
krcoles2 Posted April 17, 2007 Share Posted April 17, 2007 I have a 93 sc300 that keeps losing power, it seems to be caused when I hit the brakes, use the turn signal and sometimes while just driving, I'll lose power. Has anyone gotten a true fix to the problem? Quote Link to comment Share on other sites More sharing options...
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