You will need to locate and take out the unit that is BM54 so it may be taken or sent to a repair website.
The genuine BMW BM54 repair is generally so straightforward the unit may be returned for you on precisely the same day it's received, or done in a couple of hours (should you take it in to a repair centre yourself) to be picked through to the day you drop it in.
The BMW B54 radio unit is manufactured by a company called Becker, whose high class audio has been keeping BMW and Range Rover owners (among others happy for many years. You will find a BM54 unit in some Land; the BMW 3 series; and the BMW X5 and Range Rover models. Your owner's manual should tell you what model of BM54 unit you've got in your car.
The BMW BM54 repair begins with fault analysis - so that you need to tell your engineer what's wrong using the unit. Common faults in the BM54 comprise decline of total loss of audio sound to one or more channels; or only a number of the speakers working. Take note that if one of your loudspeakers is faulty, or just the speakers in one area of your vehicle are faulty, it may well not be the BM54 unit at fault but wiring inside the doors.
You'll have your BM54 unit before you send it away for the BMW BM54 repair assessed for faults in situ. It's best Range Rover to do this because otherwise you will not know for sure that it's the unit itself causing the issue. And of course if you send that unit off with no problem,, it will come back not needing fixing and also you'll still have that issue - plus you may have needed to pay the BMW BM54 repair center for its time.
You are able to request the center to which you're sending it to do a full BMW diagnostic check on it before they begin to repair it in case you are not sure where to get a BM54 checked before repair.
Every BM54 unit is located under the spare tyre - typically in the boot well, in a somewhat different place. For instructions on removing the unit that is BM54 before the BMW BM54 repair, refer to websites or have a look in your manufacturer's guide. If you have some questions contact the business that's going to do your diagnosis and fix and get their guidance.