Mercedes-Benz C-Class (W205) 2015 - 2021 Owners Manual > Warning and indicator lamps: Overview of warning and indicator lamps
Some systems will perform a self-test when the ignition is switched on. Some warning and indicator lamps may briefly light up or flash. This behavior is non-critical. These warning and indicator lamps indicate a malfunction only if they light up or flash after the engine has been started or during a ...