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Home >> Mercedes Benz >> 2021 >> S560 Base >> Repair and Diagnosis >> Electrical >> Motors, Switches, Relays >> Electrical System, Equipment & Instruments - 217 Chassis (4 Of 8) >> Testing & Repair >> Remove/Install DC/DC Converter Control Unit For Windshield Heater - AR54.21-P-1603LC

Remove/Install DC/DC Converter Control Unit For Windshield Heater - AR54.21-P-1603LC

Model 217 

with code 597 (Heated windscreen) 

Fig 1: Windshield Heater Control Unit Component Location - Model 217 With Code 597
G15299946WARNINGREMOVINGINSTALLINGTORQUE SPECIFICATIONTORQUE SPECIFICATIONCourtesy of MERCEDES-BENZ USA
WARNING Risk of injury  . Moving parts can pinch, crush or, in extreme cases even sever extremities. No parts of the body or limbs should be within the operating area of mechanical components when moving components. Model 217
with code 597 (Heated windscreen)
with code P17 (KEYLESS-GO package)
AS00.00-Z-0009-01A
Notice Information on preventing damage to electronic components due to electrostatic discharge   AH54.00-P-0001-01A
  Notes on HANDS-FREE ACCESS Model 217
with code 597 (Heated windscreen)
with code P17 (KEYLESS-GO package)
AH80.61-P-0001-01A
REMOVINGINSTALLING Remove/install     
1 Disconnect ground line of on-board electrical system battery   AR54.10-P-0003LF
2 Remove right trunk trim Model 217.4
with code 597 (Heated windscreen)
AR68.30-P-4800LCA
    Model 217.3
with code 597 (Heated windscreen)
AR68.30-P-4600LC
3 Remove the auxiliary battery Model 217.364/382/384/385
with code 597 (Heated windscreen)
AR54.10-P-0007LC
4 Unclip fuse and relay module in rear and place to one side with lines still connected Model 217.3
with code 597 (Heated windscreen)
AR54.15-P-0001LF
5 Unclip electrical lines (1) from control unit bracket (2)    
6 Unscrew nuts (3)    
7 Remove windshield heater control unit (4) with control unit bracket (2)    
8 Detach electrical lines (5) from windshield heater control unit (4)    
Notice Notes on self-locking nuts and bolts   AH00.00-P-0001-01KOA
    TORQUE SPECIFICATION Nut, line to windshield heater control unit *BA54.21-P-1001-01D 
9 Release and disconnect electrical connection (6)    
10 Unscrew nuts (7) and remove windshield heater control unit (4) from control unit bracket (2) When replacing the windshield heater control unit (4).
TORQUE SPECIFICATION M6 x 1
*BA00.10-P-1002-04A 
11 Install in the reverse order    
METRIC SCREWS/BOLTS AND NUTS AS PER MBN 10 105, 10 143

Number Designation 8.8 10.9
BA00.10-P-1002-04A M6 x 1 Nm 9 13
CONTROL UNITS

Number Designation Model 217
BA54.21-P-1001-01D Nut, line to windshield heater control unit Nm 9