LX570 alarm turn on by itself

[Docboy]

Recently my 09 LX alarm turns on by itself. Truck is locked via keyfob (I hear a chirp), with all 4 windows and sunroof closed, tailgate closed, and keyfob is with me and outside of the vehicle . The alarm suddenly turn on by itself. Yes, I've checked to make sure no one is walking around the truck or touching the truck.

*Seems* to happen when it's hot and sunny outside for whatever reason. Not sure if the weather condition is related.

Any suggestions on what is causing the alarm to turn on by itself and any possible remedies? Thanks.

 

[EverywhereBear]

I had a similar experience a few years ago, except it would go off while parked unlocked in my garage with all doors and windows closed. Turned out to be some setting the dealership changed the last time it was in for service. I can’t recall the exact issue, but had something to do with the alarm setting for the interior of the truck. I thought it was electrical gremlins - thankfully I was wrong.

 

[Docboy]

I had a similar experience a few years ago, except it would go off while parked unlocked in my garage with all doors and windows closed. Turned out to be some setting the dealership changed the last time it was in for service. I can’t recall the exact issue, but had something to do with the alarm setting for the interior of the truck. I thought it was electrical gremlins - thankfully I was wrong.

Hoping here it's not electrical gremlins!

Can you elaborate more about the alarm setting? I checked out the manual, but can't find anything pertaining to the setting of the alarm.