Question about 1990 Lexus LS 400

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Will not start by key

I have a 1990 Lexus LS400 and when i put they key into the ignition and turn to start nothing happens the relay does not even click and my computer in the car is making a weird click noise when i do try to start it

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Bad ground or blown fuse

Posted on Sep 29, 2008

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93 lexus LS400


When the battery was connected in reverse some electrical components were damaged. A motor, a relay, headlights can work both ways but not printed circuits in electronics. You are lucky you did not toast your computer!!!!!!!

Nov 24, 2013 | Cars & Trucks

1 Answer

My 1998 LS400 will from time to time not start immediately. I turn the key and the lights light up-the steering wheel will turn but nothing is engaging the starter....Then after repeatedly turning the key...


Then yes you said it and proved you will need a ignition switch the electical part,this is behind the key area. If they had it for a week and would start more than likely you are safer replacing the ignition switch elecrical part, what get me is they could not fiqure it out

May 12, 2011 | 1998 Lexus LS 400

1 Answer

My lexus ls400 cranks over but wont start also the car goes dead


this could be a starter or the enigtion swicth yes if you crank the key to long it will kill the battery.

May 05, 2010 | 1990 Lexus LS 400

1 Answer

1990 Lexus LS400, Runs on a 4, 6, 8 system. Ran in 4, but would not change to 6, or 8. Replaced computer, engine did not fire. Put old computer back in and it still wont start. any suggestions?


when changing the computer you must first disconnect the battery if you fail to do so you risk damaging the computer and other electrical components. i/e fuses relays and circuit breakers.

Apr 18, 2010 | 1990 Lexus LS 400

1 Answer

My problem is i just recently bought this 1990 Lexus LS400 andeverything works fine but randomly the alarm will start going off wheni open the trunk or doors then i put the key in the ignition and itwill...


yer right,,,its a dam lexus??? there nothing but problems when they go wrong,,, not that they go wrong often, but when they do??????
i realy cant think of a way you could do what you wont to do,,,,, but i can think of a way to put it right, take it into the lexus dealer they will fix the alarm for you,,,only one thing that springs to mind is when did you last change the kye fob batterys?????
however when you do change them do it very very fast,, or you lose the coad for the alarm???
then it wont go at all,,, its a lexus!!! yuck!

Nov 05, 2009 | 1990 Lexus LS 400

2 Answers

92 Lexus LS400 only clicking noise when I turn key to start


There are a number of things that could cause that. Try turning the key to the on position and crossing the starter terminals with a screwdriver. If it starts you have a bad ignition. If it still just clicks your starter has seized up or your battery might be lacking the charge to do the job. Hope these help you.

Jun 28, 2009 | 1992 Lexus Ls 400

1 Answer

My problem is i just recently bought this 1990 Lexus LS400 and everything works fine but randomly the alarm will start going off when i open the truck or doors then i put the key in the ignition and it...


My 1991 Lexus LS 400 does something similar. When the alarm goes off I use the key to unlock the passenger side front door and it turns the alarm off. Go figure, I know it sounds funny but it solves the problem for me.

Jan 06, 2009 | Lexus LS 400 Cars & Trucks

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