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Car alarm in Lexus ES300 started going off at random when car was parked, not running. I changed the key fob battery (flat watch battery) with a new battery and it fixed the problem.
The key battery for the ls400 is PN# br1216 www.lextechautomotivellc.com
disconnect the battery
Start by replacing the battery in the remote.
Affirmative. You must find out which fuse controls the alarm and remove it prior to reinstalling or re-connecting the battery. Have your remote handy when replacing the fuse as the alarm will go off!
yes it did
The most common cause is that the rechargeable battery in the alarm siren is failing, giving a low voltage to the alarm system. When the voltage from he battery drops below a certain level the alarm system thinks someone is trying to disable the alarm by disconnecting the battery. As it thinks someone is trying to disable the alarm, it sets the alarm off.
Mine did that for a while, I tried everything, except replacing the battery. When the battery gets low it triggers the alarm. It turned out to be an easy fix
unhook the battery for about 20 sec and the alarm will reset itself.
How to disable the security alarm on a 1994 lexius ls 400
I would recommend contacting the installer of the alarm system, or refer to the owners manual of the alarm system installed.
Some alarms systems have a protection function which will prevent starting the engine is somebody tried disconnect the battery and connect it again. Also what might happen is that your alarm system doesn't have memory in the case if you disconnect the battery. Thus, if you do disconnect the battery it will reset the alarm system to the default factory settings. By default, the alarm system will block starting the engine.