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Remove/Install Control Unit For Windshield Heater - AR54.21-P-0122FR

Model 257 

with code 597 (Heated windscreen) 

with code B01 (48V technology) 

Model 290 

with code 597 (Heated windscreen) 

with code B01 (48V technology) 

Shown on model 257 

Fig 1: Windshield Heater Control Unit Component Location - Model 257 With Code 597 & B01
G14543424REMOVINGINSTALLINGREFER TO SELF-DIAGNOSTIC SYSTEMSCourtesy 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 Commission windshield heater control unit (N61). When replacing windshield heater control unit (N61).  
REFER TO SELF-DIAGNOSTIC SYSTEMS     AD00.00-P-2000-06FR
2 Remove on-board electrical system battery. Model 257, 290
with code 597 (Heated windscreen)
with code B01 (48V technology)
AR54.10-P-0022FR 
3 Disconnect electrical connectors (1).    
4 Remove screw/bolt (2).    
5 Remove windshield heater control unit (N61).    
6 Install in the reverse order