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Home >> Mercedes Benz >> 2021 >> CLS450 4Matic >> Repair and Diagnosis >> Electrical >> Motors, Switches, Relays >> Electrical System, Equipment & Instruments - 257 Chassis 3 Of 8 >> Testing & Repair >> Remove/Install Engine Sound Control Unit - AR54.21-P-0024FR

Remove/Install Engine Sound Control Unit - AR54.21-P-0024FR

Model 257 with engine 256 

with code M016 (Uprated engine) 

except code 810 (Premium sound system) 

except code 811 (High-End sound system) 

Model 257 

with code B63 (Engine sound via speakers) 

except code 810 (Premium sound system) 

except code 811 (High-End sound system) 

G14543418Courtesy of MERCEDES-BENZ USA
WARNING Risk of injury  caused by fingers being jammed or pinched when removing, installing or aligning hoods, doors, trunk lid/rear-end door or sliding roof. No parts of the body or limbs should be within the operating area when the components are moving. AS00.00-Z-0011-01A
Topical note Information on preventing damage to electronic components due to electrostatic discharge   AH54.00-P-0001-01A
  Notes on HANDS-FREE ACCESS   AH80.61-P-0001-01A
REMOVINGINSTALLING Remove/install     
1 Perform commissioning of engine sound control unit (N40/1) When replacing the engine sound control unit (N40/1).  
REFER TO SELF-DIAGNOSTIC SYSTEMS     AD00.00-P-2000-06FR
2 Switch off ignition and store transmitter key outside of transmission range (min. 2 m)    
3 Remove left luggage compartment lining at side   AR68.30-P-4800FR
4 Disconnect electrical connector (1)    
5 Remove bolt (2) and remove engine sound control unit (N40/1)    
6 Install in the reverse order