C4 stereo problem
Thread Starter
Navigator
Joined: Jul 2016
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C4 stereo problem
When I turn the radio on in my C4, I immediately get a loud buzz/hum like I'm getting feedback. Did a recon on the radio and replaced the amp in the driver's side. What should I be looking for that could cause this hum??
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,214
Likes: 1,173
From: Southlake, TX
Not many other possibilities as it is a pretty simple system; head unit to EDM to Amp/speakers.
I understand your wanting a different solution but 99% of the time the EDM on these cars go kaput.
The only thing you can do is try swapping your amp with a known working amp. If you speaker works then the EDM is good and your amps are bad.
I understand your wanting a different solution but 99% of the time the EDM on these cars go kaput.
The only thing you can do is try swapping your amp with a known working amp. If you speaker works then the EDM is good and your amps are bad.
Team Owner
Joined: Jul 2004
Posts: 28,379
Likes: 3,262
From: Hartford WI
Maybe you need to but ask yourself this. How important is it to you that you have THIS unit working? If you don't care about the radio, leave it alone. If you want a better unit, shell out a few bucks to have some guy break his back for you crawling around there and laying wire for the speakers. That is what I did with Best Buy. I made sure they left a foot on each end extra so I can go home and do the wiring myself. They are young, let them do the back breaking work. You do the soldering part.
Final option is to get someone like Dr Don to fix the parts for you. I don't know him personally so hard to say but others have said he is good. I just dumped the Bose into the trash can and added my own stereo with the modern amenities. Bought brackets for non-Bose and put other speakers in place and it all buttons up nice and neat.
Best part of all is that now I can change the speakers or head unit at whim and not be married to the outdated Bose crap. Yes, it was great at one time but not anymore. Fixing it costs money and makes me have to keep everything Bose. Now that it is gone, no more. I can change the fronts or backs or both and the head unit at will.
Final option is to get someone like Dr Don to fix the parts for you. I don't know him personally so hard to say but others have said he is good. I just dumped the Bose into the trash can and added my own stereo with the modern amenities. Bought brackets for non-Bose and put other speakers in place and it all buttons up nice and neat.
Best part of all is that now I can change the speakers or head unit at whim and not be married to the outdated Bose crap. Yes, it was great at one time but not anymore. Fixing it costs money and makes me have to keep everything Bose. Now that it is gone, no more. I can change the fronts or backs or both and the head unit at will.
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Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
If its all 4, it might be the CDM and I might have a fix for that. (I just did an inexpensive repair on mine)
Got any electronic and soldering experience ?
Last edited by pcolt94; Mar 28, 2018 at 12:45 PM.
good price - only used for 28 years.... 
Team Owner
Joined: Jul 2004
Posts: 28,379
Likes: 3,262
From: Hartford WI
Burning Brakes
Joined: Nov 2016
Posts: 761
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From: Buchanan GA
Team Owner
Joined: Jul 2004
Posts: 28,379
Likes: 3,262
From: Hartford WI
Pretty simple for me. Spent too much money with upgrades and we don't throw away our toys just because something new and shiny comes along. Play till it is broke then I get to buy a new toy. Rules or we will simply buy things, throw them away when the next color comes along.
Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
Do you have any assurance that the parts were checked out or working?
You can always swap the left speaker box over to the right and see what the result is. If it still hums it's (probably) not the speaker box.
Other than the hum, is there any audio or sound that comes out of any speakers?
Can I make the assumption that the radio was working normal at one time and then the problem developed? That would indicate the wiring is OK probably.
You should change one thing at a time or you don’t have a base line or reference as to what is good or bad. More than likely only one item is bad however with new items brought into the picture it makes for more variables.
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,214
Likes: 1,173
From: Southlake, TX
Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
Thread Starter
Navigator
Joined: Jul 2016
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