When the ignition is reel on,
the warning
lamp in the instrument cluster lights
up briefly and thereby indicates the operational
readiness of the entire airbag system
and the belt tensioner.
Airbag system malfunctioning
In case of a malfunction have airbag system checked immediately.
In case of a malfunction have airbag system checked immediately; otherwise, there is a risk that the system does not function as expected in case of a severe accident.
BMW X3 Service & Repair Manual > Electrical: Controller
REPLACING VOLTAGE REGULATOR
Necessary preliminary tasks:
Switch off ignition
Disconnect battery negative lead
Notes on removing and installing electronic control units.
Remove alternator
Bosch:
Release protective caps (1).
Bosch:
Release screw (1) and nuts (2), remove cover.
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