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Remove/Install Touchpad Control Unit - AR54.21-P-0503FRA

Model 257 

with code 446 (Touchpad only) 

except code 448 (Touchpad) 

G14543426Courtesy of MERCEDES-BENZ USA
Topical note Information on preventing damage to electronic components due to electrostatic discharge   AH54.00-P-0001-01A
REMOVINGINSTALLING Remove/install     
1 Perform initial startup of touchpad (A105) Only when replacing touchpad (A105).  
REFER TO SELF-DIAGNOSTIC SYSTEMS     AD00.00-P-2000-06FR
2 Remove center console cover (1)   AR68.20-P-2350FR
3 Unscrew bolts (2)    
4 Remove touchpad (A105) with lower control panel at the left (N72/4) and lower control panel at the right (N72/5)    
5 Remove left lower control panel (N72/4) and right lower control panel (N72/5) When replacing touchpad (A105). AR54.25-P-0005FR
6 Install in the reverse order