[V8] Bose Air Raid Siren

[Buchholz, Steven]

Ich auch ... 

... but for me it was the driver's side door.  I think right now #2 is
running with only the passenger's door speaker in operation!

My recommendation to you is to pull the door panel and get the speaker
unit unplugged ASAP.  The amplifier unit is going to be getting very hot
... it is probably too late to repair yourself, but I'm concerned that
it might get hot enough to cause other damage.  In my case I think I'll
be using the Bose service mechanism to get things back to work ... 

I'm pretty sure the problem is the same as the others ... a bad
electrolytic capacitor somewhere.  A simple short from a faulty device
should not cause an oscillation ... but a bad cap in a feedback loop
very well can ... 

As to the sound coming and going with the radio in SAFE mode ... the
deck energizes a relay that provides power to the amplifiers ... doesn't
matter whether or not the radio is producing an output signal ...
whenever the amps have power they will oscillate ...

Steve B
San Jose, CA (USA)
> 
> > Turned on the radio and almost got blasted out of the seat, the most
> > god-awful siren like noise came out of the drivers side 
> speaker.  It's
> > LOUD, painfully deafening loud.  Radio changes stations 
> etc. but the only
> > sound emitted is the siren.  I pulled the radio out of the dash,
> > disconnected it, and even when turned on in "safe" mode, 
> the siren comes
> > on.  Anyone ever come across this?
> > 
> 
>  Hopefully you'll forgive me for laughing hard enough to 
> nearly split my gut. 
> LOL
> 
>  With all the Bose equipped cars I've driven and worked on 
> I've had this 
> happen in exactly one car...from one speaker. I was driving 
> John J's sweet 200q20v 
> through an empty parking lot when suddenly the right door 
> speaker started 
> this incredibly horrid squeal at around 110db!  I nearly 
> drove over a parking 
> block! Glad it didnt happen in traffic.
> 
>  I never attempted to t/s the amp but my guess is one leg of 
> a transistor  
> shorted to a direct ground causing an uncontrolled current situation.