bmw with srs light on

The dealer has the equipment to retrieve stored diagnostic fault codes from the computer. They will get you into the right circuit or system with the problem, not necessarily to the defective part.

The most common cause is a broken clock spring under the steering wheel. That is a wound-up ribbon cable in a plastic housing. When it breaks completely, the horn will also stop working.

also if the gauge cluster has been removed or replaced that light automatically comes on and has to be reset by the dealer as a deterrent to odometer tampering.