No audio after installing new battery

Dec 12, 2016 | 02:34 AM

xxZZxx

Thread Starter

Newbie

Joined: Dec 2016

Posts: 5

Likes: 0

2005 CLK55 AMG

No audio after installing new battery

I recently got a new battery for my CLK55 and replaced it at Oreilly's. Since then there would be no sound coming from the speakers, even though Command is on and not muted. I can switch radio channels and between CD/radio/AUX, and I have tried plugging in my phone and CDs and there would still be no audio. I asked the guys at Oreilly's and they said the car might have a charging module that needs to be reset by MB? I only got the car recently so I am still getting familiar to it. Is this a known issue that I need to bring to the dealership?

I have also tried resetting everything by disconnecting the battery for 5+ min, but still same problem. Also since the replacement I can only adjust the headrest up but cannot power it down (not sure if relevant).

Thanks everybody!

My car: 2005 CLK55 AMG, the speakers are Harmon Kardon

Dec 12, 2016 | 03:14 AM

400ixl

Senior Member

Joined: Feb 2016

Posts: 468

Likes: 68

From: UK

E250 AMG Sport Convertible

Got an amp and blown the fuse?

Dec 12, 2016 | 09:02 AM

insame1

MBWorld Fanatic!

Joined: Feb 2011

Posts: 2,562

Likes: 197

From: Austin, TX

2006 E55, 2012 GLK350 & 1992 190e sportline

Was your key in the ignition when they swapped the battery? Have you had an issues with the system before that?

Dec 12, 2016 | 12:19 PM

xxZZxx

Thread Starter

Newbie

Joined: Dec 2016

Posts: 5

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2005 CLK55 AMG

I can't remember if the keys were in the ignition or not, and I did not have any issues with the system before changing the battery.

Dec 12, 2016 | 09:07 PM

MarcusF

MBWorld Fanatic!

Joined: Apr 2005

Posts: 3,784

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From: SCV SoCal

2002 CLK430

Leaving the keys in the ignition while changing the battery is a very bad idea. However, if the car starts, I don't think that's the problem.

Do COMAND units require a code after losing power? Other MB HUs do, and they won't produce any sound until the code is entered.

Dec 12, 2016 | 09:34 PM

xxZZxx

Thread Starter

Newbie

Joined: Dec 2016

Posts: 5

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2005 CLK55 AMG

Yea I know some cars have a radio code so I called the MB dealership and they did gave me a code for my VIN. The weird thing is there is never a prompt to enter any code on Command and even after I disconnected the battery for 5 min and reconnected it, Command would start up just like normal, minus the sound part.

Dec 13, 2016 | 08:11 AM

insame1

MBWorld Fanatic!

Joined: Feb 2011

Posts: 2,562

Likes: 197

From: Austin, TX

2006 E55, 2012 GLK350 & 1992 190e sportline

I have pulled my battery many times and never lost command. I am guessing fuse. I have seen the key left in do some weird things like fry the headlight ballasts.