BMW radios unlocked online — Business, Professional, Reverse and Bavaria units answered from the serial on the casing label.
A BMW head unit that has lost power asks for its code on startup and never shows the serial, so the unit has to come forward out of the dash. Business and Professional units release with a pair of U-shaped keys; wide Bavaria units take four flat keys.
Nothing needs unplugging — pull the radio far enough forward to read the label on the top or side of the casing.
On the label, look for the 14-character string: PH7850S1101535 on a Philips unit, BP6262V7022261 on a Bosch one. Ignore the BMW part number (65.12-8 383 147 and similar) — that names the model, not your unit.
Straight answer about BMW codes. The two families are answered in two different ways: Bosch labels are calculated from the serial, and Philips labels are looked up in our database of 489,000 BMW unit codes. Both are free — emailed after a 24-hour wait, or straight away if you would rather not wait. Becker BE… labels have no formula we trust yet, so that format we cannot answer at all — we say so on the spot and charge you nothing for it.
Business CD, Business RDS and Reverse units carry a PH7850 / PH7851 serial:
PH7850S1101535
Bosch-built units start with BP and are answered by calculation:
BP6262V7022261