Alarm Keeps Going Off ?

[rangermastiffs]

1998 LS400

Alarm keeps going off on it's own when I lock car, it is causing Battery drain and I am now leaving doors unlocked !!!

Any suggestions to sort this out ??

[M.IQBAL]

hi

first and foremost check and make sure you dont have any metallic objects (keys/coins) stored in the armrest

regards

miq

[steve2006]

Also check your door courtesy light switches are all working correctly as on earlier models these did cause alarm problems when they go intermittent and the alarm then thinks a door has been opened and it goes off.

[beavisrules]

is there a way to see what triggered the alarm?. can't remember if it leaves a message on the screen

does it go off straight away , of maybe after a while?

top of my list to check would be car Battery holding charge.(charged good Battery should be able to sound the alarm all night without going flat!)

door (and bonnet/boot) switches as mentioned above.

the shock (or whatever) sensor is mounted under the arm rest - usually just loose in there , might be worth adjusting it (or unplugging it?).

[GEN]

If you are using the remote to lock/unlock I suggest you press the lock button twice instead of once - I had the same problem as you and since I have done the above it has resolved the issue.

[rangermastiffs]

Thanks for the replies and I have now tried / considered them all ....

Last night as I returned to my car (which was unlocked) I pressed the remote to open the boot, nothing happened so I used the key and that set the alarm Off, I used the remote to reset and then drove away.

At my destination when I tried to lock car with remote I could hear the locks 'click' but the indicators did not flash and the door did not actually lock (I tried several times). I used the key to lock doors and left the car (alarm not going off).

On return to car remote would not open doors and I used key and then drove home.

When home I tried remote to lock doors and it did as it should and indicators flashed and No alarm all night.

I went out to car today and boot opens fine with remote and ALL seems good, (doors, boot and no alarm)

Only thing I can think is key has reset after using manually to lock/open doors ??????

I will continue to monitor .............. (remote has new Battery fitted couple of weeks ago)

thanks for help/suggestions.

[itarumaa]

I had similar problems with 1998 Ls400, what I did was reset the system by disconnecting the Battery, then reattached the - and + cables.

If you have any issues with Battery connection you will most likely get all sorts of weird problems, including alarm problems.

After the reset I have not had any alarms issues what so ever.