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I have a 1990 lexus ls 400. the alarm keeps going off everytime the door is opened and then it wont start. the keys DO NOT work for locking or unlocking the car. what can i do to get the alarm to stop and to get the car to start. i have school that starts in 6 days and my wife is about give birth any day now, so must get this car going without having to take it in. not sure if this means anything but i noticed that when battery is connected that every time i try to unlock the passenger side door from the inside it locks again on its own.

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  • Cars & Trucks Master
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You need to unlock the door with the keyfob that originally came with the car when it was new,that is the only way,if you dont have it,you will have to get it from a lexus dealer.

Posted on May 06, 2017

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Posted on Jan 02, 2017

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alicantecoli
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SOURCE: using the remote or the door lock inside the car not working

remove the door panels and give everything in sight a good squirt of engine oil in a proper oil can .DO NOT USE THAT SPRAY FISH OIL STUFF ,wd40

Posted on Nov 20, 2009

  • 166 Answers

SOURCE: 1990 lexus ls 400 security system went off now

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.

Posted on Mar 25, 2010

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6_21_2012_4_31_57_pm.gif6_21_2012_4_32_59_pm.jpg

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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. 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

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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!

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

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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.

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