Bluetooth In A Classic Mercedes Without Ruining The Dashboard

Almost everyone who owns an older Mercedes eventually wants two things from the stereo: their phone's music, and a hands free call. Almost everyone solves it the same way, by pulling out the original head unit and fitting a modern one with a glowing screen and a plastic fascia adapter.

It works. It also permanently changes the one part of the dashboard your eye goes to, and the fascia adapter never quite fits. Worse, it is difficult to undo, because the original unit gets sold or lost and the wiring gets cut.

There is a better answer, and it is not new: keep the original radio and modernise what is inside it.

What a converted Becker actually is

Becker built the radios for Mercedes-Benz for decades. On a W124, W201 or W126 the unit in the dashboard is a Becker, and its front panel is part of how the interior was designed: the same typeface, the same button feel, the same warm backlight as the switches around it.

A conversion keeps that panel and that housing, and replaces the audio path behind it with a modern Bluetooth board. From the driver's seat nothing has changed. Your phone sees a device, pairs with it, and plays.

We do this to two units in particular:

• Becker Classic BE2010, the one fitted across a lot of late W124 and W202 cars.
• Audio 10 BE3100, the later Mercedes badged unit.

For a newer car there is the same idea further up the range, such as the W211 Audio 20 with Bluetooth.

Be clear about what you are getting

It is worth being straight about the trade, because a conversion is not a modern head unit and you should not expect it to behave like one.

What it does. Streams audio from any phone over Bluetooth, at a quality limited by the speakers rather than the radio. Keeps FM, and the cassette or CD mechanism where the unit had one. Looks and feels exactly like the original, because it is the original. Bolts straight into the factory aperture with the factory harness, no adapter, no trimming.

What it does not do. There is no screen, so no album art, no navigation and no track titles. Control is the original buttons and your phone. Hands free calling depends on the unit and the microphone fitted, so ask before you assume it. And it will not turn a 1990 four speaker system into something it never was: if you want real volume, the speakers and an amplifier matter far more than the head unit.

If those trade-offs sound wrong for you, fit a modern unit. That is a legitimate choice. Just make it deliberately, and keep the original radio in a box rather than selling it, because the next owner will want it.

Why originality is worth actual money here

W124 and W201 values have been climbing for years, and the cars carrying the premium are the honest, unmolested ones. The dashboard is where a buyer looks for evidence of a hard life. A neat, period correct radio says the car has been looked after by someone who understood it. A blue LED aftermarket unit in a trimmed hole says the opposite, whatever the service history claims.

That is the argument for a conversion in one sentence: it is the only route that gives you modern audio and costs you nothing at resale.

Already have the original, but it is locked?

This is the most common reason people give up on a factory radio. Disconnect the battery, or pull the unit out to check the model number, and it wakes up asking for a code nobody has. It sits there useless, and a modern replacement starts to look reasonable.

You almost certainly do not need to replace anything. Becker codes are tied to the radio's serial number and were recorded, so the code for your unit exists. Enter the last four digits of the serial on our code finder and it will tell you immediately whether we have it. Checking costs nothing.

Two things to know before you start guessing. Some Becker radios do not take a four digit code at all: on units without a numeric keypad the code is a sequence of presses on the station preset buttons, which is why a four digit number from a forum will never work on them. And the units lock out for longer and longer after each wrong attempt, so if the first code is rejected, stop.

Which unit fits your car

Fitment is by aperture and harness, not strictly by model, so a unit from one chassis often goes into another. The safest approach is to slide yours out and read the label on top: the model number starts with BE and four digits. Send us that number and we will tell you what will drop in.

Beyond radios we hold a good deal of W124 and W201 interior stock in Europe, including the wood trim that usually needs attention at the same time. If you are working through a dashboard, it is worth doing the radio, the wood and the cluster in one go rather than taking the console apart three times.

Tell us what you have and what you want it to do, and we will tell you honestly whether a conversion is the right answer for your car.