ChitChat

So why do you think my alarm went off for no explainable reason today? My car is parked in front of my house and all of a sudden I hear an alarm going off. Now, I've never heard my own alarm so I wasn't even aware it was mine until it kept going and I realized it might be mine. So I went to look out the window and I couldn't decipher where the sound was coming from because there's a lot of cars around here (I just woke up and I wasn't dressed to go outside). So for the heck of it, I grabbed my fob and kept pressing buttons to see if it would go off. I was so flustered and nothing went off so I thought it wasn't mine. Then I held down the red button and it finally went off. Embarassing because all the neighbors were looking out their windows. LOL

Has this happened to anyone for no reason? Does it mean someone tried to open my door (which I doubt because it's broad daylight in a quiet neighborhood). What warnings should I look for on the dash when I go in there for the first time after shutting off the alarm?

RXSF

there will be no warning signs on the dash or anything. I cant tell you why it was going off, but fwiw, I cant lock my cars in my garage because they all (not only lexus, but mercedes too) go off after some time. something in my garage is interfering with it.

Johnny

Is it possible something was pressing hard against your keyfob? This happens sometimes if I squat when it is in my pocket and something like a key accidentally sets it off. In fact, it happened to me just three days ago...

It could also be a defective keyfob that is transmitting without warning.

wyau01

It could be the GBS. You should the the dealer to look at it, set it to a less sensitive level.

Stormforge

possibly GBS, but the OP didn't say whether he has GBS installed. afaik, GBS is an optional accessory and i don't think there are alot of 3RX owners with this (if i recall, only kitlz and myself have GBS installed)

afpj

Check for weak/defective car battery. When voltage fluctuates, car will think something being opened.

owenu

I have an RX450 - 2years old and my wife has an IS250 4years old. In the last month - only when in our garage, the car alarms have gone off for no apparent reason. This has occurred when the cars are both locked or unlocked. Odd that it is happening only recently to both cars. Our lexus dealer can't proper an explanation.

SteveCraig

We had both remotes replaced under warranty last year. Parked in the garage & locked. About 2:30 AM we thought we had a new alarm clock in the garage. Happened twice.

owenu

Ok - thanks Steve
So new car remotes seem to have resolved the problem?
R
Owen

SteveCraig

Fixed the issue. Both remotes were also chewing up batteries at an alarming rate just prior to replacement.

owenu

ok - thanks - will look into.
R
owenu

NateJG

Adding to the X-Files...

...while loading the car this morning in preparation for a trip, I opened the trunk/hatch using the outdoor pushbutton.

Two of the doors of the car were open.

The car started beeping and beeping. I took my keys out of my pocket. The fob is in the leather sheath, so it is less likely to have a pushbutton accidently pushed.

While holding the key in my hand (loosely), and still trying to figure out what was all the beeping about, the WINDOWS ALL WENT DOWN - THE MOONROOF OPENED!

I am absolutely sure that no button had been pushed on the fob.

I then hit the open and lock buttons; and the beeping stopped.

So...

...add this one to the X-Files.

NateJG

And I had the fob's battery changed a few weeks ago at the 30K service.

kitlz

Sounds like the unlock button on the fob was pressed. It'll open the windows and moonroof (if it's programmed) and give you audible notification. Just take the key out of the fob, insert in the driver door and turn left and hold to close eveyrthing. It'll lock the RX too. Being in the leather fob case doesn't necessarily prevent this from happening. You can ask the dealer to disable the feature.

JDR76

Is it possible that when you went to open the rear hatch you hit the "lock" button on the hatch rather than the open button? If you accidentally hit the lock button, the car would beep at you because it thinks you are trying to lock it while you have doors open.