Sound Generator, Component Description - GF49.10-P-2003RFH

Engine 274.9 in model 205.047/147/247, 253.954 with code B53 (External noise sound generator for hybrids and EV) 

Engine 274.920 in model 205.053/253 with code B53 (External noise sound generator for hybrids and EV) 

Engine 274.920 in model 253.354 with code B53 (External noise sound generator for hybrids and EV) 

Engine 654.920 in model 205.013/213 with code B53 (External noise sound generator for hybrids and EV) 

Shown on model 253.9 

Location 

The sound generator in the vehicle is at the front right above the lower front engine compartment paneling.

Task 

The sound generator serves in electric mode as an acoustic warning for other road users. Depending on speed and accelerator pedal position, the electric vehicle sound generator generates an audio signal between 0 and 30 km/h. At speeds greater than 30 km/h, the sound generator is deactivated, as the vehicle's rolling and wind noises are loud enough. The electric vehicle sound generator is connected to the hybrid CAN (CAN L).

The electric vehicle SOGE also active in reverse gear and in idle dependent on the legal requirements in the USA.

The sound generator can be deactivated using the menu in COMAND.

Wiring diagram for sound generator control unit

PE54.21-P-2115-97FBA