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Check and Troubleshoot Faulty Car Radio Components

Model: Mercedes Classe S W221, MK 5 - Years: 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
Part: Car stereo

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Video tutorial

As you may have noticed from the initial images in the video, the problem in this case is the joystick that no longer controls the radio tuner indicator and there is no audio. The various components that make up the car radio group operate via fiber optics and are all located in the trunk.

Therefore, the first step is to check which component is not functioning. Once you open the trunk, you will need to remove the carpet to access the components.

One by one, disconnect each component and connect a jumper wire in its place to bypass the temporarily disconnected component. After each bypass, always check if the system works to identify the faulty component.

Car model: Mercedes Benz S550 Year: 2007


Updated on 11 February 2026 by ScegliAuto


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by ScegliAuto

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