You'll need to locate and extract the unit that is BM54 so that it could be taken or sent to a repair website.
The genuine BMW BM54 repair is normally so uncomplicated the unit could be returned to you personally on exactly Auto Electronics the same day it is received, or done in a few hours (if you take it in to a repair centre yourself) to be picked through to the day you drop it in.
You will discover a BM54 unit in the BMW 3 series the BMW X5; and some Land and Range Rover models. Your owner's manual should tell you what version of BM54 unit you have in your vehicle.
The BMW BM54 repair begins with fault diagnosis - so you must tell your engineer what is wrong with the unit. Common faults in the BM54 contain decrease of sound to one or more channels; total loss of sound; or just a few of the speakers working. Be aware that if one of your speakers is flawed, or just the loudspeakers in one area of your vehicle are flawed, it may not be the BM54 unit at fault but wiring in the doors.
You can have your BM54 unit before you send it off for the BMW BM54 repair assessed for faults in situ. It's a good idea to do this because you won't know for sure that it is the unit itself causing the issue. And obviously if you send off that unit without a problem,, it is going to come back not needing fixing and you'll still have that problem - plus you may have had to pay the BMW BM54 repair center for its time.
It is possible to try to ask the center to which you are sending it to do a full BMW diagnostic test on it before they start to mend it in case you are unsure where to get a BM54 assessed before repair. Meaning you will pay no more than you would if you had it checked everywhere else - and if the BMW BM54 repair is not wanted, you won't have put yourself out of pocket in any manner.
Every BM54 unit is located in a somewhat different place - normally in the boot well, below the spare tyre. For instructions on removing the unit that is BM54 before the BMW BM54 repair, refer to sites or take a look in the guide of your manufacturer. For those who have some questions contact the business that is going to do your diagnosis and repair and get their advice.