Why Mercedes Radio Won’t Turn on? [SOLVED]

Mercedes radios can be difficult to work with. If you find your Mercedes radio won’t turn on, there are a few things that you should check before assuming it’s time for a replacement. The first thing to do is check the fuse and make sure it isn’t blown out.

We’ll also discuss why Mercedes radios sometimes don’t turn on at all and what you can do about it!

mercedes radio won't turn on

Why My Mercedes Radio Won’t Turn On?

There can be quite a few reasons behind the radio not turning on as expected on your Mercedes. Here are those with their fixes-

Blown Fuse

If the fuse in your Mercedes is blown out, it won’t be able to turn on. Check for this first and replace it if needed.

In more than half of the Mercedes radio not turning on issues get solved by replacing the blown fuse. So, check that before you proceed to the next step.

No Power Supply

Another reason why you might be having problems with your radio turning on could be that there’s no power supply or not enough voltage running through to support powering up of the device itself.

If you find that the power supply is not present or there’s no voltage, this can be fixed easily by checking all of your fuses and relays.

Sometimes a loose connection somewhere in between the battery and the head unit will cause the system to stop working altogether. And the solution is pretty simple.

Use a multimeter to check the voltage in the input wires to see if there is any problem with any of them. Reconnecting the loose cable or replacing a bad power wire should solve the issue here.

System Software Malfunction

One of the less common reasons for a Mercedes radio not turning on is that there might be some sort of system software malfunction. If this happens, you will need to turn the ignition off.

Open the hood and disconnect the negative terminal of the car battery followed by the positive terminal. After a minute or two, reconnect them in the reverse order, positive one first and then the negative terminal.

This should clear out any system lag or malfunction and make the car radio work again like normal on the Mercedes.

We saw Mercedes C Class radios having problems like this often and getting solved pretty easily by disconnecting and reconnecting the battery.

Bad Radio Cables

Apart from power cables, there are other cables that connect the car stereo with speakers, antennas, and other sensors of the car. Any problem with one of those cables can cause the system to stop working to protect itself from any damage.

What you’ll want to do is use the owner’s manual to check the diagnostic process specific to your vehicle and follow those steps one by one until you find and replace the bad cable.

Bad Antenna

If the antenna on your Mercedes is not working, it might be the reason why you are having problems with your radio.

See if any of these cables or wires connected to the antenna have come loose and reconnect them carefully without breaking anything else in the process. If that doesn’t help then it may be any other issue.

Input or Output Malfunction

Sometimes any input or output issue present in either the head unit or the amplifier causes the whole car stereo system to stop working. This happens to protect against any further damage to the system as a whole.

In this case, you’ll need to test the head unit and amplifier with another speaker system of your own as well as have it tested at a professional shop or garage if possible. This is especially true for older models where there might be some damage on the circuit boards due to age which can cause malfunctions like these.

Bad Radio

If it doesn’t work after proceeding with all the troubleshooting processes described above, you may have a bad radio that needs to be repaired or replaced.

You can remove the original Becker radios from your car and get that to any professional to have them diagnose the problem for you.

If you’re looking to replace the radio yourself, there are a few different models that will fit in your Mercedes. Just make sure that you get one that is compatible with your car’s system.


Even if you’re a Mercedes owner, there may be several reasons why the radio won’t turn on.

Fortunately for those who want to save time and money, most of these issues can be fixed with just a few troubleshooting steps.

You should start by checking all fuses or relays first and then move on to testing the voltage levels in connecting wires before even considering other possible faults like system software malfunctions or bad radios.

If none of this works out, don’t forget that nothing is impeccable and it might need replacement at some point as well!

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