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    1. #1
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      No Sound: HU-850

      Symptoms: No consistent sound from CD, AM/FM, Nav. Popping sound on all speakers occurring about every 10 seconds. Sound will cut out and all that is heard is a popping sound like electronics resetting. When sound is present, it sounds fine. Duration between operation and non-operation varies.

      On occasion the unit will operate on its own with no response to any button pushes on the unit or the steering wheel. The radio will play but the buttons will perform their appropriate function.
      For example: FM station is playing through the speakers but the CD player will change tracks, scan, and switch disc. Pressing the power button or changing volume has no effect. It acts as if the input is coming from a hidden unit.

      Nav audio is not heard during the outages.

      This occurs regardless of headlight operation, nav operation, dimmer settings, car in motion/parked, ECU running, engine off/idle/under load.

      Trouble shooting: I measured the voltage at fuse #10 with the engine off and measured +12.40V. Voltage did not fluctuate with popping/operation. Pulled the fuses for Audio(#10), Amp(#11), Nav monitor(#12) and Phone(#13). Fuse 10 & 11 killed the sound altogether as it should since it is the unit and the amplifier. Pulling 12 and 13 has no effect on operation/sound issue.

      Assumption: With the radio operating on its own and not accepting user inputs, I assume that one of the following is hung up or failing.
      - Audio Module
      - Accessory Electronics Module
      - Steering Wheel Module

      Is there a safe method to resetting those modules without visiting a garage?

      Any suggestions are welcome. Two other sites list similar symptoms but didn’t post the fix action.

      Car Details: 2006 V70R MT, 72,000 Mile, no current fault indications, 70F outside temp at first indication.

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    3. #2
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      Not sure what the problem is, but Athruc has a hu-850 for cheap if it comes down to that
      1998 S70 GLT - Sold
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      1997 850 GLT - Daily Driver Check It Out
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    4. #3
      Member BEJinFbk's Avatar
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      First - check the mechanical operation of ALL the buttons.
      Sounds like you may have a sticky one causing problems.

      The popping raises more questions. The last time I ran into
      something like that, someone had "added" a sub box to the
      rear speakers and was overloading the stock amp. It was
      popping when it went in and out of protect mode. Another
      possibilty is water damage to the underseat amp or it's
      connectors. Resistive corrosion can cause all kindsa stuff.
      '98 V70 R - Is the AWD worth it? You Betcha!

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    6. #4
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      I am having the exact same symptoms with my HU-850. The worst is sometimes it decides to get really loud all of a sudden and the volume controls dont respond. I turn the HU off and back on and it works again.

    7. #5
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      Quote Originally Posted by EnterTheR View Post
      Symptoms: No consistent sound from CD, AM/FM, Nav. Popping sound on all speakers occurring about every 10 seconds. Sound will cut out and all that is heard is a popping sound like electronics resetting. When sound is present, it sounds fine. Duration between operation and non-operation varies.

      On occasion the unit will operate on its own with no response to any button pushes on the unit or the steering wheel. The radio will play but the buttons will perform their appropriate function.
      For example: FM station is playing through the speakers but the CD player will change tracks, scan, and switch disc. Pressing the power button or changing volume has no effect. It acts as if the input is coming from a hidden unit.
      These two are most likely distinct problems and should be troubleshot that way. Regarding #1 popping sounds and cutting out are different as well as popping indicates noise on top of exisitng sound and cutting out means sound and silence intermixed. Are you describing to different symptoms or is the ctting out sounding like popping becasue the sounds are very brief but is not noise? If it is a single issue then it may be a protection circuit in the power amp kicking in. I believe the power amp does not power the center speaker so you could test whether this is a power amp issue by disconnecting the speaker output connector from the power amp and only running the center speaker. If the popping stops then you have an issue with the power amp, wiring, or driver. If it doesn't then it is the HU-850. Regarding #2, does the operational control return when you turn off and then on the ignition? THis would indicate potentially a software bug or a transient on the control channel. Has there been any after-market changes to the car that uses its 12v?
      2011.5 XC60 3.2L Flamenco Red/Anthracite Black, Premium, Multimedia, Convenience, BLIS, Xenon + Custom Subwoofer

    8. #6
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      Its a bit hard to describe. Basically I'll hear some popping type sound, sometimes all sound will cutout and popping will continue, sometimes the volume goes way up or down, and can't be changed with volume controles, occasionally sound will come out of a few speakers instead of all of them, not just the center speaker. I have no mods in the car. I have ordered an aftermarket stereo that I plan on putting in soon.

    9. #7
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      I would still perform the tests I described.
      2011.5 XC60 3.2L Flamenco Red/Anthracite Black, Premium, Multimedia, Convenience, BLIS, Xenon + Custom Subwoofer

    10. #8
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      Well I received my new head unit today and am wondering how I use the amp provided in the unit. Is there any special wiring needed instead of using the amp under the passenger seat? Thanks.

    11. #9
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      Greetings from Polland
      I think a have the solution for HU-850 popping sound and no sound
      I am the author of this solution.
      enjoy

      Last edited by camil9; 05-20-2019 at 06:20 AM.

    12. #10
      Junior Member omaRR's Avatar
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      Quote Originally Posted by camil9 View Post
      Greetings from Polland
      I think a have the solution for HU-850 popping sound and no sound
      I am the author of this solution.
      enjoy

      can i solve this issue by just replacing the hu

    13. #11
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      Clarificatoin of the symtoms

      The HU is doing the following things
      - Looses all audio on all speakers to include the center.
      - Generating a popping/clicking sound on all spekers to include the center.
      - Does not reset with power/fuse removal
      - Diagnostics indicate some sort of AEM-10XX fault; software related.

      I will try to get a S/W download first as it is the cheapest option as soon as I work thru VIDA/Dealer/Customer communication issue.

      @mistapony - Did you intall new HU yet? Update please.

      @omaRR - Do you have part number off IC or supplier?

    14. #12
      Junior Member omaRR's Avatar
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      Quote Originally Posted by EnterTheR View Post
      The HU is doing the following things
      - Looses all audio on all speakers to include the center.
      - Generating a popping/clicking sound on all spekers to include the center.
      - Does not reset with power/fuse removal
      - Diagnostics indicate some sort of AEM-10XX fault; software related.

      I will try to get a S/W download first as it is the cheapest option as soon as I work thru VIDA/Dealer/Customer communication issue.

      @mistapony - Did you intall new HU yet? Update please.

      @omaRR - Do you have part number off IC or supplier?
      Not at hand, i can check after work, how do i get to the IC to check the part number? I actually just ordered a new head unit last night.. although i dont want to install and give up the center channel
      06' GT S60R |TiGray |Not Stock
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    15. #13
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      Hei

      I have a similar problem except all buttons of my HU work all the time and it will not adjust volume on it own.

      Problem with my Volvo V70 HU-850 is that sometimes it works fine, but sometimes it will make just pop/thick kind of noise as described earlier. Also funny thing is that when it stops playing music and starts making that noise it will not stop (that pop/thick noise) even if I shut down the HU (power off button works, because the display goes out), it will only stop when i turn the ignition off.

      What the hell is that ?

      Regards
      Martin

    16. #14
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      Quote Originally Posted by falckranger View Post
      hei

      i have a similar problem except all buttons of my hu work all the time and it will not adjust volume on it own.

      Problem with my volvo v70 hu-850 is that sometimes it works fine, but sometimes it will make just pop/thick kind of noise as described earlier. Also funny thing is that when it stops playing music and starts making that noise it will not stop (that pop/thick noise) even if i shut down the hu (power off button works, because the display goes out), it will only stop when i turn the ignition off.

      What the hell is that ?

      Regards
      martin
      help anybody?

    17. #15
      Did you ever find out what the problem was?


      Quote Originally Posted by falckranger View Post
      Hei

      I have a similar problem except all buttons of my HU work all the time and it will not adjust volume on it own.

      Problem with my Volvo V70 HU-850 is that sometimes it works fine, but sometimes it will make just pop/thick kind of noise as described earlier. Also funny thing is that when it stops playing music and starts making that noise it will not stop (that pop/thick noise) even if I shut down the HU (power off button works, because the display goes out), it will only stop when i turn the ignition off.

      What the hell is that ?

      Regards
      Martin

    18. #16
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      I have the same issues. Did the S/W download solve the problem?
      Last edited by image; 06-19-2014 at 11:27 PM.

    19. #17
      Junior Member FATSWEDE's Avatar
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      Quote Originally Posted by falckranger View Post
      Hei

      I have a similar problem except all buttons of my HU work all the time and it will not adjust volume on it own.

      Problem with my Volvo V70 HU-850 is that sometimes it works fine, but sometimes it will make just pop/thick kind of noise as described earlier. Also funny thing is that when it stops playing music and starts making that noise it will not stop (that pop/thick noise) even if I shut down the HU (power off button works, because the display goes out), it will only stop when i turn the ignition off.

      What the hell is that ?

      Regards
      Martin
      i have the exact same issue as you. i have added an after market amp and sub by doing a bypass on the under seat amp but its worked for over a year now with no issues untill now
      Kevin Turnquist Passion Red 06 S60R in the Aptos,CA area
      proudly purchased in September 2013. First Volvo I've ever owned and it made me realize just what I've been missing out on.

    20. #18
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      I am having similar problems, with the added bonus fun that sometimes a radio station, CD, or just static will blast at full volume. And will only go away with turning the car off.

      As I understand it, the head unit (the HU-850) is sending a low-level signal to the actual amp, and all the volume control is done by it and the amp actually runs wide open all the time. So if the head unit goes crazy, whatever it sends comes out full blast - so it could be pops, or whatever sound is on, etc. And given that the head unit is really a computer, my guess is that when it goes bad, it could cause all sorts of things to come out if it "crashes". Plus, none of the buttons and knobs are real, they are only soft switches read by the HU computer, which explains why they have no effect when these problems are happening.

      So I expect changing the HU will solve all these problems, that the problem is not in the amp unit. I'm changing mine out this week, we'll see!

    21. #19
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      Did anyone find a solid solution to this? Is it the radio or amp?
      My problem started after leaving the car parked for 2 weeks over the holidays. Once I started driving it again it kept popping and playing at random, usually coming in on one speaker only, or very loudly on just the front speakers. Up to this point the only issue that I've had is the volume knob stopped working on the radio, but the volume on the steering wheel had always worked fine, up until now.

      Quote Originally Posted by v70pirate View Post
      I am having similar problems, with the added bonus fun that sometimes a radio station, CD, or just static will blast at full volume. And will only go away with turning the car off.

      As I understand it, the head unit (the HU-850) is sending a low-level signal to the actual amp, and all the volume control is done by it and the amp actually runs wide open all the time. So if the head unit goes crazy, whatever it sends comes out full blast - so it could be pops, or whatever sound is on, etc. And given that the head unit is really a computer, my guess is that when it goes bad, it could cause all sorts of things to come out if it "crashes". Plus, none of the buttons and knobs are real, they are only soft switches read by the HU computer, which explains why they have no effect when these problems are happening.

      So I expect changing the HU will solve all these problems, that the problem is not in the amp unit. I'm changing mine out this week, we'll see!

    22. #20
      Junior Member FATSWEDE's Avatar
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      When i had mine the only way to garuntee fixing, the specialist in my town said it was the main computer control unit in the car dying. Nothing to do with the head unit or amp which i tried replacing both and still didnt fix it. He said that the main control unit is just failing to function properly which is like a 2-3k fix needless to say i sold my R after hearing that since not even two weeks before i had to replace all the struts, tires brake booster pump and rear wheel bearing and add a camber kit which cost almost 6k. Im not even hard on it and it just keeps breaking more and more
      Kevin Turnquist Passion Red 06 S60R in the Aptos,CA area
      proudly purchased in September 2013. First Volvo I've ever owned and it made me realize just what I've been missing out on.

    23. #21
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      Quote Originally Posted by camil9 View Post
      Greetings from Polland
      I think a have the solution for HU-850 popping sound and no sound
      I am the author of this solution.
      enjoy



      Hello!

      Thank you camil9 for your solution for Hu-850 on my XC70 MY06! It started with popping/clicking sound from rear a few days then right front speaker. Then the CD lost sound and then I parked the car the radio came at full burst (it was on CD mode) and I got scared and jumped and scream out loud. The clicking was intensified and came a couple every minute. No CD or radio worked. I pulled the fuse but then parking assistance was quiet so I put them back. I take the radio apart and I found several cracks. First I resoldering all thru hole mounting with tin and chip without tin or paste because the legs are so tiny. It worked for some hours. Then radio came on and off. Sometimes only sound in centre speaker, I turned down volume and up again and then the sound came in all speakers. It continued to surprise me with radio or CD first normal volume first day and then at full burst a couple of seconds sometimes.
      Next weekend I connect battery and earplugs to it and found the fault (see pointing in picture) when I touch there the radio went out and finally was quiet until it was soldered again. I put on Soldering paste with nano tin and heat with a tiny tip at 375 degrees Celsius. Tried to find AM signal to put in aux adapter but it seams to be the same as FM pin from radio module. The radio have now worked for a couple of days! Thank you. Will order aux adapter now.

      Having problems adding pictures.
      Maybe will pop up several of the same picture.
      I have tried for one day now.
      Now i see why: "You may not post attachments"
      Well it was the biggest chip under the sheild as camil9 said.
      Last edited by Mikae1; 01-24-2017 at 09:03 AM.

    24. #22
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      Exact same problem here.
      It's been v. cold the past few weeks, the mornings after the car has sat for some time I can get the radio to come on for a few minutes until the cabin warms up.
      Took it to the dealer, they couldn't read any error codes and suggested I change the HU for a new one, this had fixed a similar problem they had in the past.
      Sounds like the stereo is clipping, like an old kenwood amplifier of mine did when I turned it up too loud, it is like static popping.
      Heat seems to make the problem occur, and cold seems to be the remedy I am leaning towards the solution provided by camil9, but no way do I feel confident enough to start soldering on the pcb.
      Think I am going to look for a replacement HU-850 to see if this fixes the problem.
      Last edited by .\me; 01-29-2017 at 06:39 PM.

    25. #23
      Senior Member ZZZZZZZ's Avatar
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      There is a service on eBay that does this fix, I think.
      Quote Originally Posted by .\me View Post
      Exact same problem here.
      It's been v. cold the past few weeks, the mornings after the car has sat for some time I can get the radio to come on for a few minutes until the cabin warms up.
      Took it to the dealer, they couldn't read any error codes and suggested I change the HU for a new one, this had fixed a similar problem they had in the past.
      Sounds like the stereo is clipping, like an old kenwood amplifier of mine did when I turned it up too loud, it is like static popping.
      Heat seems to make the problem occur, and cold seems to be the remedy I am leaning towards the solution provided by camil9, but no way do I feel confident enough to start soldering on the pcb.
      Think I am going to look for a replacement HU-850 to see if this fixes the problem.
      "The Real IPD" - ZZZZZZZ's thread
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      Past: 1999 Tropic Blue/Green/Oak leather V70 (NAa); Mom traded 1975 Maroon/Maroon leather 164E

    26. #24
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      I've seen the ebay service, but at $130 for repair and replacement HU-850 @ $350ish am left wondering if it is worth the investment to upgrade to an aftermarket unit?
      I've seen a couple of kits that will accept the factory amp din connection and read here: https://www.matthewsvolvosite.com/fo...ic.php?t=43215 that Volvo has a weird impedance setup.
      So am thinking that perhaps I'll take a chance and upgrade the HU to something a little more modern... not sure yet.. will ride around in silence for a couple of weeks and make my mind up...

    27. #25
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      I'm leaning towards upgrading to aftermarket as well. That link you post isn't loading for me. Maybe cause I'm at work right now. It's a valid link? Will try at home to learn more.
      2007 SapphiCama V70R 400K+/Km
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    28. #26
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      Yep - it's valid. Upgrade seems pretty simple providing you have the right harness. One of my take aways from the link is that "Volvo uses uncommon 8-ohm car speakers and wires two of them in parallel to create a 4-ohm impedance to the channel." My thoughts on this are if I use the factory amp via amp out on the aftermarket unit I can bypass some of the complications that others experience when trying to wire the Volvo speakers directly the the aftermarket head unit. Total investment at the moment is looking at $300 for the faceplate, harness and a Pioneer AVH-X4800BS. Still driving around in silence and pondering it though...

    29. #27
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      So, I went with this:

      -Esky EC135-05 Waterproof High Definition Color Wide Viewing Angle License Plate Car Rear View Camera with 7 Infrared Night Vision LED
      -MicroBypass ALL AVH-X Video In Motion Interface for Select Pioneer Receivers
      -Pioneer AVH-X4800BS 7" Motorized DVD Receiver
      -Volvo (850, S40, S60, S70, S80, S90, C70, V40, V70, XC70, XC90)Factory Amp Interface Wire Harness Cable Plug
      -Metra 99-9227 Single/Double DIN Installation Kit for Select 2005-09 Volvo S60 and V70 (Black)
      Last edited by .\me; 02-04-2017 at 07:31 AM.

    30. #28
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      https://forums.swedespeed.com/showthr...-some-guidance

      finally found the pinouts for the center speaker, - losing the center speaker and noise from bad grounding appear to be the only points of contention for aftermarket upgrade...

      For the HU-850 Green connector:
      "
      CAN is the green (low) and white (hi)
      Purple is switched power
      Grey and Grey stripe are for the centre channel speaker (even if your car does not have it)
      Red is battery power (when key in ignition)
      Brown is ground
      Blue is antenna turn on
      "

    31. #29
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      Good to know. I'm book marking this thread for when I do my upgrade!
      2007 SapphiCama V70R 400K+/Km
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    32. #30
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      Install is complete am left with the dreaded buzzing from the speakers.
      Managed to keep the factory amp and center speaker through a little creative wiring.
      Now in search of remedy to the buzzing, any advice anyone has on remediation would be greatly appreciated.
      Will post pics later.

    33. #31
      Senior Member ZZZZZZZ's Avatar
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      Look hard enough and there is a thread on that. It may be a ground issue? Let's see some pics!
      "The Real IPD" - ZZZZZZZ's thread
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      Past: 1999 Tropic Blue/Green/Oak leather V70 (NAa); Mom traded 1975 Maroon/Maroon leather 164E

    34. #32
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      Yep - was a ground issue, solution was so simple. The Volvo amp to RCA adapter contained a black wire that I assumed was ground and so I grounded it https://forums.swedespeed.com/showthr...tory-amp-audio
      removed the shrink wrap and connected the black, green and white wires together, buzzing/humming no more, now have crystal clear sound.
      Pictures coming shortly

    35. #33
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      No center speaker connection on the aftermarket HU adapter (light green lower)

      [IMG]

      A photo posted by Sean Collins (@snilloc4) on

      [/IMG]

      The factory adapter contains center speaker pins shown below two pins next to the brown (ground) wire.

      [IMG]

      A photo posted by Sean Collins (@snilloc4) on

      [/IMG]
      Last edited by .\me; 02-11-2017 at 09:53 AM.

    36. #34
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      The harness that I bought contained a green connector for power etc and a grey connector for speakers. Since I was going to use the factory amp I cannibalized the grey connector and pulled two if the wires out. the wires have a metal lip that you can flatten with a screwdriver and easily remove. Just be sure to bend it back up when you re-insert it into the green adapter.
      [IMG]

      A photo posted by Sean Collins (@snilloc4) on

      [/IMG]

    37. #35
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      I inserted these into the green adapter where the center speaker wires should be, the pic below you can see them next to the black wire (lower left) they are grey and black and light blue:
      [IMG]

      A photo posted by Sean Collins (@snilloc4) on

      [/IMG]

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