Which Service/Upgrade To Go For?

-Amp Upgrade. The most common one, is the IC Amps failing and causing one or more speaker to stop functioning, or causing distortion. This can happen permanently, or after about 10 seconds to a minute of switching it on. And if you are really unlucky all 4 channels would have gone off. As long as you can still change radio channels, switch between Modes, and the amber light is still ON, next to the volume knob, then the unit is 100% repairable. 

The bonus of having this repair done, is that the sound will be improved. The usual power output is 20 watts, and the after the repair with our stage 1  amp upgrade, you are running 40 watts.  

Stage 2 Amp Upgrade

Some cars are equipped with DSP Amplifier or Harmon Kardon Sound upgrades from factory. The DSP amps do tend to fail as well as the BM54s, so if I receive a BM54 already 100%, you will be notified, and have the option to receive a refund, minus the postage costs back to you. Also, as the DSP only uses 2 channels from the BM54, it puts less stress on the amps, and less likely to fail with this fault. Range rovers tend to suffer with water condensation, and occasionally the pins fall off!  

The Harmon Kardon amps equipped in some cars are very reliable, so the chances of them failing is quite slim. Unless water damaged.

-Speaker faults. As these cars are getting older, I have been seeing more and more speakers failing. The best and cheapest way to test this, is to use a multimeter. Here is a diagram of the pin out for the BM54 connection. 

So with the multimeter set on the lowest ohm reading, you want to measure the + and – of each speaker input. The BM54 does not need to be plugged in for this, infact, its best to not have it plugged in, for a cleaner test. All speakers should read 4 ohms. Anything less, and its not 100% healthy. Usually, when it reaches 0, the speaker is dead. So the channels are as follows, 

Pins 1 and 5 is for Rear Right Speaker

Pins 2 and 6 is for Front Right Speaker

Pins 3 and 7 is for Front Left Speaker

Pins 4 and 8 is for Rear Left Speaker

This test does not work on cars with DSP or Harmon Kardon upgrades, as the speaker wires do not travel directly to the speakers. 

–Processor chip replacement. Buzzing, squealing type noise as shown in the video below. 

–No power. The amber light next to volume knob is OFF, and the controls on the left side stop functioning. The first thing you should do, is disconnect the BM54 unit for 30 minutes, and reconnect again. This will occasionally bring it back to life. The repair success on these are 80%.

Additional Upgrades

– RCA Preouts Channel Outs for aftermarket amps, is also available on request from a cost of £30.  Will also come with 12v Remote cable for easy plug and play for your aftermarket amp and sub installation. If you want to amplify your whole car, we can also do a full RCA connection of all 4 channels for £50.

-Firmware Upgrade for £40.

Auxiliary input options

-Bluetooth Music Streaming via mobile phone, which does not effect the Bluetooth connection you already have in your car for phone calls. This is available for £60. 

-Bluetooth Music Streaming+ Hands Free via mobile phone (note: will have to feed microphone to front cabin area). This is available for £80. 

-3.5mm Jack cable, default is usually a male connection. You can have female also, which can make a nice OEM installation somewhere in your car. The cost for either male or female is £20.

Please note, all cabled AUX inputs are 4-5 meters long.

OEM Factory Bluetooth Hands Free Retrofit

– We can retrofit inside the BM54 / BM53 the latest Generation 13 ULF Bluetooth unit. You will receive OEM microphone, pairing button and Bluetooth receiver. The cost is £249.99.

Why Choose My Service?

Full test station, with all the components from the Ibus station, including tv tuner, navigation drive, screen, cd changer, bluetooth ulf and the BM54. All 4 channels can be tested individually. Unlike other repairers, who have no way of testing the units.

I have repaired and upgraded over 5000 BM54 units worldwide with 100% success and 100% Feedback.  Full refund is always given, if a unit is not repairable, you have sent us the wrong unit or you are unhappy with it.

As well as the BM54 unit, I can do repairs on other Becker units, like the radio modules on the K1200LT bikes, Logic 7 amps with bass faults, ASK systems, CCC idrive etc.

My goals are always to give 100% customer satisfaction, to help out other BMW enthusiasts and to give a Fast Turnaround on all my items/replacements.