I installed a Kenwood KDC-BT858U deck this past summer and use the bluetooth on it along with my Galaxy S3 to play music. I first noticed the symptoms when I flashed my high-beams, and it occurred randomly when I flashed. The sound would be normal, and when I flashed, sometimes it would stay normal, sometimes it would BLARE the volume to the point of distortion. Now that it's pretty much winter season here (rain for 6 months), I've been using my rear wipers more, and I figured out tonight that when my rear wipers are on auto, the sound will blare randomly as well.

All I need to fix the sound from BLARING DISTORTION to regular volume is to pause the music for a few seconds, then unpause it again.

I'm not quite sure whether it could be a short somewhere in the wiring since I didn't splice into the steering column stalks, and it's happening over bluetooth. I haven't yet tried whether these symptoms happen if I'm listening to the radio or CD (I'll try tomorrow). My soldering skills aren't 100%, but I'll have to check that I properly sealed my splices as well when I get a chance to rip apart my console.

Any thoughts?

Does it have a physical line in you can try? does it do this with CD or Radio sources?

It does not happen when I use the radio/CD player and flash my high beams or use the rear wiper. I will have to investigate further.

Sounds like your bluetooth receiver is close enough to the wiring that receives the extra output for those things. Just as a simple troubleshoot, move the adapter if its a plug in one like mine is. If its a built in receiver then call Kenwood and inquire to it, worst they'll tell you to do is check your fuses in the vehicle.

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Ill try calling them. I also deduced that the issue ties in with my subwoofer wiring. I had a flat tire last week and had to remove my woofer from my trunk to get my spare, and I was driving around without the sub wired up for a few days. I tried to reproduce the symptoms the other night when it was raining to no avail. I may have to re-route the wiring to my sub. The Kenwood unit does not have a bluetooth adapter, it is built in.