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Discussion Starter · #1 ·
I'm hoping someone else has had this problem, or a similar one and can give some input. About a month ago, the radio in my 2013 C30 started cutting out, then cutting back in every few minutes. After about a week of this, it cut out and never came back on. This affected the radio, CD player and hands-free phone. The display still shows the HVAC information, so it doesn't seem to be a power issue. When you turn on the radio, the time comes up in the upper left corner, but no radio display info and no sound. A Volvo mechanic friend connected his laptop to the OBD port and the program indicated that the amplifier appeared to be fine and no fuses were blown. However, it did NOT indicate what WAS wrong. He opined that he thought it may be the "bluetooth module" which I know nothing about. He said that it is inline with a cable connecting the head unit to the amplifier. He said that one way to confirm this would be to locate the module behind the glovebox, disconnect the male and female plugs from the module, then plug the male & female plugs together. If the system then works, then the module is bad. He also said that, if it IS the bluetooth module, that it's a Volvo-only part and very pricey. Before I blow my next weekend doing this, I thought I try to crowd-source a solution from the SwedeSpeed community!
 

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something in the MOST chain died so you'll need a MOST isolator and go through the components one by one until you find it.
 

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Discussion Starter · #3 ·
Now, if I only knew what the MOST chain was, what items were included in it, how to find it, and if WalMart sells MOST isolators, I'd be good to go! Seriously, I really DO appreciate the response, but it wasn't terribly helpful. Clearly, something in the audio chain of components is not functioning, but which one? How to locate it? How to test it?
 

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Take it to a shop then, anything beyond that and you are over your head.

Sent from my SM-G973U1 using Tapatalk
 

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Discussion Starter · #5 ·
"you are over your head"

Hence, the reason for my posting! I'm an old-school gearhead, and I've done everything from a total engine rebuild on a Lotus, to dozens of car audio installations, including one very complex one. HOWEVER, cars of the last 10-12 years seem to require a lot of computer knowledge, well beyond simple mechanics. My city does NOT have a Volvo dealership (a mixed blessing, from what I hear), and my local Volvo independent (owned by our last dealership's head mechanic) has spent a couple of hours attempting to diagnose my problem, without success. First, they said they didn't think it was the amp, now they say they think it is the amp, but they're not sure one way or the other. Now, it comes down to whether or not I want to pay them $90 and hour to swap out each component until they find the one that's bad. Even he says that I'd be better off just replacing the system with a better aftermarket system. Being unknowledgeable of all of the various cross-integrations of all these components, I'm concerned that some audio shop will be likewise unknowledgeable and wind up screwing something else up by accident. I was hoping for a crowd-sourcing solution from some member who has faced a similar problem. I've heard that these Volvo audio systems are known for problems, so I thought there would be a lot of co-miserators!
 

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Good luck. From what I've seen you MAY get lucky and have someone post with the EXACT same problem with a solution. Other than that, keep us posted with your troubleshooting, if you decide to pursue. Be wary of the after-market stuff, for there be new and exciting mysteries to solve.
 

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Discussion Starter · #7 ·
Just an update: After my Volvo specialist mechanic first said it wasn't the amp, then said it probably WAS the amp (but he didn't know for sure), I stopped by a local car stereo specialist shop. For $87.50, they went through the system and determined that the problem was MOST LIKELY the Alpine head unit, removed said unit and shipped it off to a specialty repair shop in Syracuse, NY. I've been waiting over two weeks now to hear from the NY shop as to what is specifically wrong and what it will cost to repair.
 

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Discussion Starter · #8 ·
Latest update: After five ridiculous weeks, the head unit came back from United Radio in Syracuse with a note saying that there was nothing wrong with it. Local car stereo shop said that maybe re-booting the whole system on the re-install could cure the issue. Sadly, it did NOT. So, now we have a head unit confirmed fine, the amp that the Volvo diagnostic software says is fine, connections under the dash are fine, no corrosion on the connections board behind the glove box, AND we took the bluetooth unit out of the chain, connecting those two cables together directly, and still nothing. Now, they're saying that perhaps it's the fiber-optic cable. It seems like no one really knows what they're doing, just making guesses and swapping parts. The fiber-optic cable is Volvo-proprietary, and like most Volvo factory parts, extremely overpriced. I don't want to replace it if I don't have to. I can't imagine that I'm the only P1 platform owner in the country that's ever had this problem, so PLEASE, can anyone shed some light on my problem?
 

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Fuse?
 

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My parents had a problem where the head unit screen went black in their S80. Volvo dealer replaced the head-unit and all was right afterwards.
 

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My AM radio is dead on my P1 but, everything else (FM/SAT/CD) works fine--when it all dies I won't touch nothing--fingers crossed. Zero help, sorry.
 

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Discussion Starter · #13 ·
I read your thread and it seems similar, but in my case, the system is dead ALL the time. I thought overheating might be the issue initially, because it would work intermittently, then come back on, but now it never comes on at all, even in the cooler evenings. We've eliminated everything FOR SURE except the cables and the amp, and my mechanic says that his diagnostic software says it's not the amp. However, we haven't yet pulled the amp out and tested it specifically. I even replaced my cabin air filter! It's been very frustrating. Meanwhile, the system in my wife's three year older V70 works perfectly, and she's not even a big music fan!
 

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My money is on the HU. I doubt the amp would make the whole thing go dead. Too bad you don't have a test unit to swap it out with.
 

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Discussion Starter · #15 ·
Thanks for your input, but earlier in the thread, I mentioned that we had pulled the Alpine head unit out and sent it to Volvo's own audio warranty shop, United Radio in Syracuse, NY, who pronounced it in perfect working order. I'm currently looking to my Volvo shop to find a working amp unit that we can substitute into the chain to see it that's the problem. Next would be the optical cable. I was hoping to avoid all this labor, but no noe seems to have had the same problem I have.
 
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