cosmicfireball Posted May 29, 2004 Share Posted May 29, 2004 ...that when the battary goes dead it causes all manner of problems with the alarm system. A freind sold here sc300 'cause she could't solve this problem....As I understood what she told...the battery went dead,the security system disabeled the ignition system(not to mention the sound system security codes stuff)and when battery was charged up the vehicle was still disabeled......many hours at the shop,on several occassions,much headache....she sold the car for this reason....Is it plausable? I'm considering owning a 1992 sc300,manual,and wonder if someone can inform me of the security system for this car? Thanks Quote Link to comment Share on other sites More sharing options...
JDOwen2 Posted May 30, 2004 Share Posted May 30, 2004 I'm not aware of a problem with the factory alarm system. I have had other vehicles with aftermarket alarms that took some time to reset after the battery was disconnected. Quote Link to comment Share on other sites More sharing options...
SKperformance Posted May 30, 2004 Share Posted May 30, 2004 sounds like they didn;t go to lexus to have it diagnosed it is easy enough to figure out what is wrong with it Quote Link to comment Share on other sites More sharing options...
soarerTT Posted May 31, 2004 Share Posted May 31, 2004 i and many others im sure disconnect the battery all the time wen working on the car, i had my battery die on me a few times before i got my new one, i have a sc300 manual and no problems like hers. although i used to work at this shop and we had a couple people come in with a problem like that, on aftermarket alarms (not the ignition though) and we just messed with it and got it to reset. but i am sure that if you get stuck like her all you have to do is take it to a dealer and they will tell u whats wrong, she must have not cared for the car or been wanting to sell it to dodge that easy of a thing to do Quote Link to comment Share on other sites More sharing options...
mcorbett58 Posted January 24, 2006 Share Posted January 24, 2006 I know this is an old thread, but I hope you all can help me. I have the same problem on my 91 SC400. Yesterday I went to the car and found the battery was dead. This has happened a couple of time in the past, so I didn't think much of it. I disconnected the battery, charged it up for several hours, and tried to hook it up. Suddenly, the horn is going off, the doors lock, and the car won't start. I pulled the horn fuse, so my neighbors would kill me, but the stupid alarm has been triggered, and I can't figure out how to reset it. I don't want to spend too much money on fixing this, because I'm planning on selling the car soon, but I really need to use it until I do sell it. ARGH! Any help? Mike Quote Link to comment Share on other sites More sharing options...
JIBBBY Posted January 24, 2006 Share Posted January 24, 2006 I have disconnected my battery so many times on my 1992 sc400, and never had a problem like that...on other sc's as well through the years. If the alarm goes off hit the disarming button on the key or use the key to open the passenger side door not driver side door. If memory serves me right, the alarm will go off...everything will reset.... If that doesn't work disconnect the battery completely again wait and re-try...Should not be a problem. Quote Link to comment Share on other sites More sharing options...
SKperformance Posted January 24, 2006 Share Posted January 24, 2006 If the button does not work ,turn the key in the door lock and it will disarm the alarm. Just make sure the door is closed first Quote Link to comment Share on other sites More sharing options...
mcorbett58 Posted January 24, 2006 Share Posted January 24, 2006 If the button does not work ,turn the key in the door lock and it will disarm the alarm. Just make sure the door is closed first YAHOO! That did it. I don't have any remote or "button" on my key for the alarm, but the key in the door lock fixed my car. Thank you, guys. I really do appreciate your help. Mike Quote Link to comment Share on other sites More sharing options...
lexus411 Posted January 24, 2006 Share Posted January 24, 2006 this happens when the battery usually goes dead while the alarm was going off . This prevents someone from disconnecting the battery to kill the alarm and bypass the system. Put the key in the door will do the trick Quote Link to comment Share on other sites More sharing options...
bubbasc400 Posted January 26, 2006 Share Posted January 26, 2006 I have a 95 SC400 after letting the car sit for about 2 or 3 days, The battery was dead. I recharged my battery and everything is fine for now. As long as I'm driving the car everything is fine. But if I let it sit for a day or two the battery goes dead.(with a new battery at that)...Any Ideas ????? : Quote Link to comment Share on other sites More sharing options...
NicksLex03 Posted March 7, 2006 Share Posted March 7, 2006 I have a 95 SC400 after letting the car sit for about 2 or 3 days, The battery was dead. I recharged my battery and everything is fine for now. As long as I'm driving the car everything is fine. But if I let it sit for a day or two the battery goes dead.(with a new battery at that)...Any Ideas ????? : There is a short in the electrical system in the car that is grounded and draning the battery or you are leaving a light on. Quote Link to comment Share on other sites More sharing options...
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