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Alarmingly loud static hiss/roar through the speakers on sitting into the cars
Alarmingly loud noise- just shy of speaker damaging, hearing damaging. Ever hear one of those tire blasters- like a propane tank with a ball valve to beading stubborn tires? Almost like that- or very like that but a little slower and as heard from across a shop.
But made with static through the speakers, with the audio system shut entirely off, and not having put the key in the ignition yet.
I don't have air suspension, or I'd have thought it was an air leak...
But anyway it does it about 30-40% of the time I get in, and did it once when I shut off the vehicle- though I may have turned it back on to check something- that was the first time and it alarmed me into not being able to remember. IIRC once when driving, too.
I actually thought it was a burst aerosol can. (Anyone remember the Benz owner on a forum, who had the memory seat setting back over a can of spray paint jammed under the seat track - and tear it open? What a mess!)
I'm wondering about the warnings of water in floor wiring? Though I am in a dry period in Canada (cold and dry).
I'm thinking I'll pull the radio fuse, see if that cures it. Out of my 6 vehicles I 2 have no radios, and of the rest I have turned them on less than once a year.
I just didn't want to hide a warning sign, if this is trying to "tell" me something.
Find the subwoofer and subwoofer amplifier under the floor of the cargo area... someone just recently had so much water back there for so long, the amplifier chassis was rusted brown. Also check under your carpet to see if the padding is wet in driver/passenger foot areas. If you find current moisture, 1 or more roof drains are likely backed up. If your car fogs on the insides of windows after it sits for a while in cold temperatures, you may have damp carpet padding. The carpet itself can feel completely dry while the padding is saturated with water. It will be quite difficult to dry the carpet padding in cold temperatures. Our carpet padding dried out in 3 days of 100 degree high temperatures with the sunroof, doors, and hatch open and parked in the driveway. There is info on locating the roof drain caps in the DIY section here... but if the whole car isn't above freezing, the drains won't drain until the water thaws.
No fogging inside. Well a little b/c I did expect the HVAC to default back to auto on each start up, and of course it doesn't. And my drivers Fanspeed Up toggle has failed, which took me a few days to learn the work around of adjusting in mono from passenger side, though it doesn't say Mono on the display as I interpet it should from the manual.
I'm into the cargo area a weekend coming up for tailgate struts which are in transit. Floor carpet, I'll have the DIY up and follow.
I'd be mildly surprised if I have water. We have "prickly pear" cactuses wild on the ground not all that far (100mi) east of where I am- many aren't aware of that in Canada- kind of counter to stereotype. Yep they freeze solid (-15F)and regrow every year. And right now, a month into ownership, this is the drier season of a dry area. Dew, frost, yes, lots. And snow - of various water content- cold days there is far less water in light, dry powder, snow than a heavy dew yields, for example.
It did get washed prior to my pick up from the previous owner, though.
Your post title mentions when sitting. Do you mean it occurs when you sit down and or step into the car?
May be worth checking the battery start nut just in front of the lower part of the seat is fully tight?
Maybe it is a little loose causing slight disconnect/ reconnection with foot movement??
Is it the full factory stereo, or are there aftermarket parts installed somewhere?
If everything is original, I can only guess that you have water damage to some wiring or component. Possibly the subwoofer/amp below the cargo area, or the main amplifier in the side pocket.
A Link to fuse diagram. This exact same thing happened to me today for the first time. Very loud hissing and popping coming from speakers as soon as I opened the drivers door before even turning ignition power on. I need to take a look at the trunk bottom too when I get room in the garage. The noise is very clearly originating from the amplifier, there simply isn't anything else in the system that could produce such distortion/interference noise. Interesting enough, my car has never had this particular problem before but has had a battery that goes from full to flat in about two weeks if not driven. If the amp power input is always hot, that could explain the power drain. I always thought it would be switched on by remote by the head unit.
I wouldn't expect a repair shop to be able to do much in the way of repairs... Bose does things their own way (No highs, no lows, must be Bose) and aren't designed like typical amplifiers for typical speakers. If there is something obviously damaged in the amp... like a burned-up component or burned circuit board trace, that can possibly be repaired. But it can be difficult to diagnose Bose compared to other amps. I would check Audi & VW prices for a new amplifier. Someone bought a new Bose subwoofer amp for less than $200 as I recall. I would also be interested in looking at the wiring diagram for the fuse #12 circuit to see if there is an associated relay that closes, but can't stay closed so you end up with power-no power-power-no power repeatedly. The removing or restoring of power could be the cause of the popping and there may be nothing wrong with the amplifier... unless there is a relay in the amplifier itself that is doing this on-off-on-off thing. Lots of amplifiers make "pop" or some other muted sound when they are power-up and sometimes when they are powered-down.
Last edited by ScootCherHienie; 02-07-2021 at 03:15 PM.
Except Bose speakers and amplifiers are not "normal" and are not directly replaceable with a "universal" amplifier unless you completely remove 100% of the Bose system and replace everything... new cables, everything new with "standard" audio gear that is all interchangeable.
I found this wiring diagram in another thread on Bose problems:
The fuses for the Subwoofer and Amplifier say "Relay Energised" - I wonder if this refers to a separate relay in the system (fuse box or nearby) or a relay in the amp/subwoofer itself.
Just for closure I thought that I would post the solution to my Bose problem.
It was actually the fuse for the DVD/Satnav.
I hadn't really considered this as I don't use the satnav unit as I have replaced the headset.
But with the Satnav fuse gone the Subwoofer would get a signal to turn on - but I guess the MOST circuit wasn't complete so it would power down again - only to get the signal to power up and repeat the cycle.
So ScootCherHienie was close with the idea of a relay powering up and down.
It's a bit of a pain as - if the dvd for the satnav ever fails I would likely have to repair it just to keep the rest of the system going.
Mine went away with warmer weather. I've done various maintenance and small repairs, but nothing that related, and it went away once we were consistently melting during that day.
So I think the advice about water was good. As in, would that increase in temp have allowed drying out? yes probably.
02-04-2021 | 12:05 AM
Alarmingly loud static hiss/roar through the speakers on sitting into the cars
