Question about 1990 Lexus LS 400

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Car I have a 1990 lexus ls400 and tonight when i went to unlike the doors the alarm went off and know when i go to start my car it will not start due to the anti theft its like it has sut down how do i enable that security for it to start again

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  • trophygf May 18, 2009

    For some reason, my key wouldn't unlock the car door--it wouldn't even fit in it anymore. When we had a locksmith come open the door, the alarm went off. Now the anti-theft system won't allow us to start the car. What's to be done?!

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Your keys are prob. worn. My car did the same thing until i got very expensive new keys made.

Posted on Jun 09, 2009

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1 Answer

Anti-theft switched off my starter...how do bypass that issue?


Depending what part of the country this car was purchased originally, the alarm system can be different. These are after market systems installed by the distributor or dealership. Different systems are connected differently. Either way the alarm system is connected to the engine controller and or the main electrical circuit. This has to be removed and the circuit reconnected. I would advise taking to a car alarm specialist and have them replace or remove it.

Feb 12, 2014 | Lexus LS 400 Cars & Trucks

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1990 lexus ls 400 security system went off now vehicle will not start. Keys open door turn alarm off but starter will not engage. What can I do?


Your alarm is keep your system from starting. When the alarm system fails, you have 1 of two choices, if it is a after market alarm then just disconnect the alarm, if it is a manufacture alarm then you will need to take it to a company to have then replace the alarm or disconnect it. Doing so yourself you can hurt your vehicle more then help it

May 17, 2010 | 1990 Lexus LS 400

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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 ls 400 security system went off now vehicle will not start. keys open door, turn alarm off but starter will not engage. had problem 2 months ago changed car battery. vehicle started, but the...


Okay you may want to check to see if the sensor on door lock cylinder hasn't fallen off from the lock itself. Pull of the door panels and check the wires at the door lock cylinder. Hope this helps.

Mar 25, 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

1 Answer

I purchased a 1990 Lexus LS400.


well your best bet is take it to the lexus dealer to get your oil changed and just tell them you just got it and you would like it looked over good trust me as slow as shops are right now they are gonna do a good inspection hoping to make money.. lol but make sure you go to the dealer cause they know what the commen stuff ya know

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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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