See also:

Vanity mirror in the sun visor
Mirror light 1 only functions if the sun visor is clipped into retainer 2 and mirror cover 5 has been folded up. ...

Conditions for activation
RACE START can be activated when:  - the doors are closed.  - the engine is running and it has reached an operating temperature of approximately 176  °F (80 °C). This is the case ...

Vehicle data, GL 550
The data stated here refers specifically to a vehicle with standard equipment. Consult an authorized Mercedes-Benz Center for the data for all vehicle variants and trim levels. ...