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Hi All, first time poster.

I have an 09 Mazda 6 Sport with BOSE system in the UK.

I had the Aux socket into my blackberry playing some music loud. All of a sudden, nothing, no sound out of any speaker. No hissing, no pops, nothing out of all speakers.

The head unit is still showing AUX, it will play CD's and you can change radio chanels etc. I have made sure it is nothing to do with Traffic Announcements. It is not bluetooth based either as I have turned that off too.

Interestingly, the phone still works with bluetooth, but you can not hear the caller. They can hear you so the microphone is still working.

Has anyone got any suggestions. I wonder if it is that the cable has fallen out of the back of the unit. That being the case, I have no idea how to get to it.

As ever, I have just past 60,000 which means no warranty on it.

Thanks for reading, any help would be much appreciated.

Regards

Titan
 

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It's rare, but the 1/8th inch cable could be busted. Is the cable frayed anywhere?

From the sounds of what you've described, nothing that's supposed to be output from your blackberry is being pushed through the car's speakers, but everything else works fine. - That would be either your blackberry's jack is busted, the cable is busted, or the AUX on the system is busted.

Have you tried another cable to eliminate this possibility?

I went through your description again, so even with Bluetooth you can't hear anything? Maybe your blackberry was still in AUX mode, just like the car stereo, and it was trying to output through the 1/8th inch jack, but obviously with nothing connected, or if the cable is bad, that wouldn't work.
 

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Sorry, I might not have been clear. Nothing works, no CD no Radio, no telephone calls. The blackberry was connected when it went dead.

Would anyone know how to get to the back of head unit to see what is going on?
 

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Sorry, I might not have been clear. Nothing works, no CD no Radio, no telephone calls. The blackberry was connected when it went dead.

Would anyone know how to get to the back of head unit to see what is going on?
Definitely sounds like a fuse for the Bose amp. If you are getting all the lights on the stereo to work and cd to track and play, but there is just no sound. It more than likely is a fuse. Check all the fuse boxes for a bad radio/audio/audio amp/internal labeled fuse. If you can't find a bad fuse it might be worth the money to have the amp checked at the dealer. If it has gone bad you can always look for another one amp or just replace the stereo. Probably just a fuse though.

That wiring harness on the back of the stereo isn't just going to have a issue unless someone has been back there messing with something. The ones I have seen from factory are put together and snapped in very well.

Good luck
 

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Mazda 6 Sport 2008 - Bose sound - No sound from speakers but displays.

MAZDA 6 SPORT 2008 - BOSE SOUND

Is there anyone out there who can help with my Speakers.
I have display but no sound AT ALL???? So frustrating!! I have CD - Radio - Aux displayed but not a sound????
I had sound then the next time I got into my car, Nothing Absolute Zilch!!
I have turned volume right up and not even a murmur.
I have checked all fuses (internal-passenger side & under bonnet-RHS looking at engine).
If there is someone out there that has come across this problem and got a resolve then please Help Out>...
This all seemed to have happened after I plugged my Sony Experia Z1 into the Aux and was working fine but the next time i got into my car Nothing?? Sound had completely gone. By looking at the previous msg above it seems he has had the same problem.
Kind Regards Pete G...
 

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I know this thread has long been abandoned but I'll share this post here as well for anyone that was like me recently, desperate to find a solution. I have an 07 Mazda6 with Bose and posted this in another thread already.

I had this exact same problem and the information available on the internet is surprisingly sparse for this issue, despite it being fairly common. Strangely, it was a thread for the Millenia where I found the clues to the source of the problem.

The issue is, apparently, the head unit, at some point starts to fail to send a low amp signal to the Bose Relay under the hood...and once this signal fails to be sent, the relay never switches, and the Bose amp never powers on. The strange thing is, this failure can be intermittent as mine was. I went three weeks with no audio, then all of the sudden it started working again. This is how I knew for sure that A) no fuses were blown and B) my amp wasn't toast.

Under the hood, you can remove the not-broken relay for the Bose system and place a paperclip on the two silver contacts, completing the circuit to power your amp. If your issue is the same as mine you'll have sound as soon as you turn your stereo on. I suppose it's possible you just have a bad relay, but I swapped mine with a neighboring good relay, and nothing changed.

I haven't yet implemented a permanent work-around for this failure of the head unit's, but there are definitely many ways to work around this. I haven't decided yet which way I want to go. I currently have a 10 amp fuse jammed into the silver contacts, meaning my amp is technically always on But I have sound back!!
 

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I know this thread has long been abandoned but I'll share this post here as well for anyone that was like me recently, desperate to find a solution. I have an 07 Mazda6 with Bose and posted this in another thread already.

I had this exact same problem and the information available on the internet is surprisingly sparse for this issue, despite it being fairly common. Strangely, it was a thread for the Millenia where I found the clues to the source of the problem.

The issue is, apparently, the head unit, at some point starts to fail to send a low amp signal to the Bose Relay under the hood...and once this signal fails to be sent, the relay never switches, and the Bose amp never powers on. The strange thing is, this failure can be intermittent as mine was. I went three weeks with no audio, then all of the sudden it started working again. This is how I knew for sure that A) no fuses were blown and B) my amp wasn't toast.

Under the hood, you can remove the not-broken relay for the Bose system and place a paperclip on the two silver contacts, completing the circuit to power your amp. If your issue is the same as mine you'll have sound as soon as you turn your stereo on. I suppose it's possible you just have a bad relay, but I swapped mine with a neighboring good relay, and nothing changed.

I haven't yet implemented a permanent work-around for this failure of the head unit's, but there are definitely many ways to work around this. I haven't decided yet which way I want to go. I currently have a 10 amp fuse jammed into the silver contacts, meaning my amp is technically always on But I have sound back!!
Thank you for taking time to share this. It's invaluable information. You're a saviour. I have the same problem. It's intermittent, and a fairly rare occurrence, but still very annoying.

How can I tell which relay is for BOSE amp? Can the relay be replaced or repaired?
 

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I'm guessing this reply may come too late but I'll take a look when I get home and try to send a pic

Sent from my SM-G960U1 using Tapatalk
 

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I'm guessing this reply may come too late but I'll take a look when I get home and try to send a pic

Sent from my SM-G960U1 using Tapatalk
Thank you @spearoid. I couldn't find the relay, but I found a fuse labelled as BOSE amp in the main box under the bonnet. Remarkably, it was the culprit, at least in my case. While looking for the relay I found the fuse and noticed the whole box was very dusty. I realised the contacts might have corroded, so I decided to clean them. Since all other electronics on the car worked well, I chose to clean just the amp fuse and its socket. And it worked! :surprise: Cloth and contact spray did it. That's all. :smile2: The amp didn't start right away, but next morning it turned on and has worked without a fault for a few months now.

In short and for the posterity, BOSE amplified intermittent operation (not working sometimes) problem could possibly be solved by cleaning pins of the amp fuse and the socket in the fuse box under the bonnet.

Please don't forget to disconnect the battery while doing this and good luck. :grin2:
 

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I have Found a fix for this issue!

I was digging around in forums all over the world and a particular one in eastern europe had all the answers, i have since tried it successfully fixing the issue for under $100 AUD

The issue lies within the Stabilizer, Digital Signal Processor or the Integrated Circuit(?) components of the computer board inside the amplifier under the seat Each of these cost around USD$5 (+$5 postage) from Aliexpress…
You then will likely need someone skilled with microsoldering computer chips. I used a local iPhone repairer who did it for $75.

See (attached) components towards the back of the chip, black squares, labelled CS42438 (circuit), DSPB56374AE (digital signal processor) and STL05-3300 (stabiliser).
These are relevant for model GS1E 66 920A, I had a different model amp with a different DSP but the other two were the same.


The first thing you will need to do is take out the amp and open it up (need a T(10?) screwdriver) and have a look at the chip, get some good light and a magnifying glass and have a look at the numbers and letters written on the parts. There are some other numbers written underneath but they are irrelevant. Then head over to Aliexpress (don’t know where else) and search for each part. Mine took about 2 weeks to send to Aus.
Had these changed over by my guy and sound has worked perfectly since!
Happy days. Please let me know if you have any questions!
 

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Wow!

I have Found a fix for this issue!
How fortuitous... I've just developed the same issue; I haven't had it long enough to tell if it is intermittent or not. Was yours intermittent? Everything on the stereo appears to be on and working, just no sound. Did you try the relay short method described above? Do you know of any other fuses that affect the stereo system, besides the ROOM fuse? are there any hidden in the HU or AMPs?

Thanks for this awesome find.
 

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I have Found a fix for this issue!
How fortuitous... I've just developed the same issue; I haven't had it long enough to tell if it is intermittent or not. Was yours intermittent? Everything on the stereo appears to be on and working, just no sound. Did you try the relay short method described above? Do you know of any other fuses that affect the stereo system, besides the ROOM fuse? are there any hidden in the HU or AMPs?

Thanks for this awesome find.
Yes it was intermittent I bought the car in jan and the previous owner said it works sometimes. I found it worked about 2% of the time usually on colder mornings.

It was the same situation, all looks to be working, but 0 sound. I deducted that these are the hallmarks of a faulty amp as the amp distributes the signal it recieves from the head unit. As it is “downstream” from the signal, the HUD would not be affected by a fault in the amp.

I tried checking/cleaning/resetting the Bose fuse in the fuse box to no avail. I believe the bypass would work too, but I didn’t bother since it would have been too temporary/ sound would have been very wea. I received a wiring diagram from Mazda for the sound system as well (attached).

The above fix made such an immediate and undeniable difference that I can’t expect it to be anything else. Because of how crap the help I got with this I am Happy to help anyone directly dawsonr8 @ Gmail
 

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