Billyismyname

I’ve posted before where the sound just cut out while I was driving on the highway and out of no where the sound went out while playing the radio.

I just swapped out the AMP with another one and still nothing. I did a hard reset and even set factory settings to the radio. I honestly don’t know what else could be causing this. Does anyone have any ideas? I’ve checked every single fuse and relay. Batteries are good and healthy as well.

nota_amg

Optical loop interrupted?
Bad Head unit(pre-amp)?

LILBENZ230

OP needs to update profile to show what year his W212 is. If it is before 2016, there should be an engineering menu that allows a diagnostic test of the audio system components IIRC?

Billyismyname

2014 E350. I went into the engineering menu and found nothing with the diagnostic test.

Billyismyname

could very well be the optical loop being interrupted. I have to take it to Mercedes but they charge an arm and a leg to test

nota_amg

self diagnostic should show if there is a loop interruption. know anyone that'll let you swap head units for testing?

Billyismyname

I think the head unit is coded with the VIN, so I wouldn’t be able to do it my self. Someone at Mercedes would have to do it for us

LILBENZ230

The 2014s are the ones known to short/melt the wiring in the HK system. No weird smells or anything?

Have a look here for engineering menu screen shots:

https://mbworld.org/forums/glk-class...ml#post6691974

Billyismyname

I went into the engineering menu and found that the “loud speaker” had an error code and says “NG”. I reset the system but nothing.

I also found that the amp i purchased off of eBay is a 9055 model and the model I have is a 9056. Literally the same shape and everything just different model. Not sure if that’s a problem or not.