The radio module or amplifier (these are the same item) will probably be faulty, we can remove the unit from your car and then repair the BM54 the same day.

These units are made by Becker & have BMW part numbers. Which include 65.12-6 922 510 & 65.12-6 922 515, 65.12-6 922 510 (65126922510), 65.12-6 922 511, 65.12-6 933 091,65.10-6 933 092, 65.12-6 934 650, 65.12-6 941 691, 65.12-6 943 452, 65.12-6 972 667, 65.12-6 907 131, 65.12-6 919 079, 65.12-8 379 787, 65.12-8 385 898, 65.12-6 906 738, 65126922511, 65126933091, 65106933092, 65126934650, 65126941691,65126943452, 65126972667, 65126907131, 65126919079, 65128379787, 65128385898, 65126906738.