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

Model 223 

with code 597 (Heated windshield) 

except code ME10 (Hybrid vehicle (plug-in, PHEV)) 

Model 223 

with code Z07 (B7 armoring on special protection version) 

with code Z17 (Heated windshield) 

except code ME10 (Hybrid vehicle (plug-in, PHEV)) 

Fig 1: Control Unit For Windshield Heater Components Location - Model 223 With Code 597, Z07, Z17 Except Code ME10

Courtesy of MERCEDES-BENZ USA

Notice	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Notes on safety-relevant components		AH00.00-Z-0019-01A
	Remove/install
1	Disconnect ground line of 12 V on-board electrical system battery.		AR54.10-P-0051S
2	Remove spare wheel well trim.	Model 223 with code 597 (Heated windshield) except code ME10 (Hybrid vehicle (plug-in, PHEV))
			AR68.30-P-4620S
3	Disconnect electrical connector from windshield heater control unit (N61).
4	Remove electric lines (1).	Nut, line to windshield heater control unit	*BA54.21-P-1001-01D
5	Unscrew screws (2) and remove windshield heater control unit (N61).
6	Install in the reverse order.