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      07-25-2018, 07:01 PM   #1
loome
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No audio

Hello, i recently bought a 2014 bmw 335i xdrive from a used car dealer ship. I had it for 2 weeks now with out any issues. (except when i drove it off the lot, there was no sound coming from the radio. but after a minute or 2 it started working. I just thought i wasn't using it right) However this week when i turn on my car the radio didn't work. Now it just cuts in and out.
I also get no
-door chimes
-navigational directions
-the time on the head unit doesn't work
-Bluetooth audio does not work
-Aux audio does not work
-cd/dvd audio does not work
-SOS might work but i can't hear anything so who knows
-parking sensor sound does not work
-no directions on my heads up display (but speedometer on heads up display works)
I also can't
-mute
-turn up/down the volume
However when the sound comes back everything starts working again.

Things i have try
-disconnect negative battery terminal
-taken my dash apart to check wiring
-check all fuses
-check amp
-the red light on the fiber optic is not always there
- try with engine on and off

Sometimes i get lucky and everything works perfectly for a few days
I know e90 had similar issues and all they had to to do was use a fiber optic jumper. But im not sure where all the modules on the f30 are or if it even uses a similar system
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      07-25-2018, 10:13 PM   #2
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Could be a number of things... but I suspect the amplifier is dying / almost dead.

Any diagnosis on this forum would be mere speculation (as is mine above).
You really need to bring it in to a BMW dealership, and have them plug it in to figure out the problem.

Did you get any kind of warranty with the car? ie. do you think the used car dealer will pay to have it fixed?
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      07-26-2018, 02:18 PM   #3
loome
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No warranty, guess i got to book an appointment. Thanks anyways
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      07-28-2018, 02:37 PM   #4
Jhnblckwood
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Quote:
Originally Posted by loome View Post
No warranty, guess i got to book an appointment. Thanks anyways
Download ista n read out fault codes when ur not getting sound.
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      07-29-2018, 12:03 PM   #5
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Amp going bad or wiring to amp shorted.

And why drive off the lot with no audio?

Wonder if you purchased a flood car.
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      07-29-2018, 09:15 PM   #6
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Quote:
Originally Posted by IK6SPEED View Post
And why drive off the lot with no audio?
Kinda what I was wondering...
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      07-30-2018, 12:39 AM   #7
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Judging by the symptoms, you must have Harman Kardon which feeds the audio through the optical most bus. If the time is not syncing it's quite possible that you have some sort of short on the most bus and it might not necessarily be the amp.

I would have someone with ISTA scan it for faults and go from there as others have suggested.
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      01-27-2019, 11:15 AM   #8
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Hello

Hey brother. I hope you had figured out the problem and fixed it. I am dealing with the same exact issue. Do you mind telling me what the problem was? Thanks
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      07-29-2020, 08:12 PM   #9
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Angry same issue F30 2014 320i Base Hi unit

dimbo617 did you figure out what the issue was? I have the exact same issue. I replaced the main battery after it had completely died. To get to the trunk I had to remove the back seat, but I checked and didn't see any wires pinched. I used ISTA+ and there are no faults. Test comes back clean. The amp doesn't have any signs of water damage or rust. All my fuses are good. No chimes no sounds nothing. Radio still pulls an HD signal.
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      01-23-2021, 07:46 PM   #10
yaseenhantouli
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Please Update

Hey guys please if any of y'all have fixed this problem, please post a reply on how to fix it
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      11-14-2022, 05:50 AM   #11
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Every thing works but no sound

Quote:
Originally Posted by yaseenhantouli View Post
Hey guys please if any of y'all have fixed this problem, please post a reply on how to fix it
Hi all am having the same problem!
I've owned my f31 for 5 years full bmw history.
And last week out of the blue everything works as it should but I have no sound from anything ( H K system)
PLEASE HELP
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      12-01-2022, 09:03 AM   #12
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Question F33 2017 435d MSport Xdrive

The amplified is dead and needs replacing but a new one is £500. My uncle's car who is now retired and hasnt got a lot of money to blow anymore.

The car has the Harmon Kardon sound system.

Do I have to get the exact part number 9393194? Ideally I just want to buy a unit, for the old loom to be unplugged and the new one in without any tuning or messing around.
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      06-17-2023, 03:00 PM   #13
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Can someone help!?
I got a HU swap from entry to NBT EVO, but before the swap my sound went out and screen got stuck on “bmw” logo and nothing worked, I figured that the speakers just blew out and it wouldn’t make sense to get new speakers and the screen is still stuck so I just swapped the HU and the screen and got a another set of used oem speakers from eBay, apparently to complete the retrofit I had to put the Combox in a loop and connect everything to the HU but now even with the new set of speakers and HeadUnit installed I still don’t get any audio through the car like no chimes, nothing from the radio, no audio from calls, or Bluetooth audio but everything works on screen.
I’ve been doing research and checked all the (radio/sound) fuses n they’re fine none blown
I need help!!
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      01-08-2024, 11:20 PM   #14
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Quote:
Originally Posted by aslezak View Post
dimbo617 did you figure out what the issue was? I have the exact same issue. I replaced the main battery after it had completely died. To get to the trunk I had to remove the back seat, but I checked and didn't see any wires pinched. I used ISTA+ and there are no faults. Test comes back clean. The amp doesn't have any signs of water damage or rust. All my fuses are good. No chimes no sounds nothing. Radio still pulls an HD signal.
Same here, just ran into this issue all fuses good, checked the amp no sign of moisture. F31 Harmon Kardon Hifi all speakers no sound. Nav Works tunining radio works Bluetooth works etc No dong or warning sounds.

Also before all the sound went out about a month ago dong and sound sounded distorted from the front left tweeter
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      01-08-2024, 11:24 PM   #15
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Did anyone get this fixed? Sharing would be appreciated
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      01-09-2024, 12:29 AM   #16
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If you eliminated the HU and the speakers (as if all the speakers would fail at once 🤦‍♂️) you seem to be down to the amp! Imagine that!
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      03-02-2024, 01:33 PM   #17
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Quote:
Originally Posted by Dazeeksta View Post
Did anyone get this fixed? Sharing would be appreciated

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