Four days ago, my 2005 SRT-6 began to make a beeping/squealing sound coming from the dash on the passenger side.

The sound is high pitched.
It lasts anywhere from 1 to 5 seconds in length, with quiet periods of 0.5 to 20 seconds in between.
The sound only occurs while in motion.
It is coming from the interior, and cannot be heard from the exterior.
I've tried turning off the A/C, and that has no effect.
It occurs while accelerating, coasting, and breaking... if the car is in motion, it occurs.
It doesn't seem to be effected by speed -- it occurs equally in frequency at 5mph and 70mph.
It occurs both when the radio is on and when it's off (it's coming from the dash, not the speaker).
It occurs both in turns and while driving straight.
There are no lights indicating there is an issue (except the low tire pressure light is constantly on, but that's been on regardless of tire pressure for over a year. I've learned to ignore it).
The crossfire has 58,000 miles if that's relevant.

Any ideas as to what's causing this, and how it can be fixed?
I'll provide more information if needed.

 

Other than location, it sounds like it would be the seat belt warning.

 

I'm getting the same sound? Did you find out that it was from seat belt?

 

Original post from 2015, probably no longer around.

 

It’s been discussed on here before with a longer thread. Not sure what to search for though. FWIW I had the same problem when I bought my car 5 years ago. It only seemed to happen when I had my ac/heater on 0. When I have it set between 0-1 I’ve never heard that sound again. Maybe try that as I think it might have something to do with the ventilation. Mine was more of a high pitched sound though. Use the search function and you’ll more than likely find the thread I’m talking about, and it’ll have more updated info than this older post. Just make sure you see the date before posting. A lot of the time these members are not active anymore.

 

There is a white vacuum valve under or behind the glove box and it has caused noises before.
Use search, posts, white valve, it pops up regularly.
SEARCH is your best friend on this forum.