Posts: 6
Joined: Wed Sep 19, 2018 10:58 am

No sound from speakers

My 2014 rex started having an issue with the Harman kardon audio system two days ago.

Idrive/headunit all function normally but there is no sound output from any of the speakers. Fm band, Bluetooth connection, parking audio warnings are all not producing any sound. Only the initial startup tone is audible. I removed the rear seat and disconnected/reconnected the HK amplifier but that did not resolve the issue.

Scanning the car with bimmerlink produced one error each on the amp and the headunit:
Amp - b7f4a8 front left bass channel error
Headunit- e1c440 reset

Clearing the errors did not help.

My feeling is that maybe the amplifier has gone out, but I don't know how to test it.

Any ideas?

Perhaps the connection from the headunit computer module to the amp needs reseated ?

Thanks in advance,
Posts: 6
Joined: Wed Sep 19, 2018 10:58 am

Re: No sound from speakers

Re fuses:

I checked all these fuses:

None were burned out :(
Posts: 4
Joined: Tue Jan 18, 2022 10:42 am

Re: No sound from speakers

Did you find a solution to this problem? This is just occurred in my BMW I three as well.
Posts: 6
Joined: Wed Apr 13, 2022 11:22 pm

Re: No sound from speakers

I’m having the same issue with both front door speakers and the front tweeters anyone found the solution

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