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Home >> Mercedes Benz >> 2019 >> GLC300 Base >> Repair and Diagnosis >> Electrical >> Motors, Switches, Relays >> Electrical System, Equipment & Instruments - 253 Chassis - 4 Of 7 >> Testing & Repair >> Remove/Install DC/DC Converter For 48V On-Board Electrical System - AR54.10-P-1351LWO

Remove/Install DC/DC Converter For 48V On-Board Electrical System - AR54.10-P-1351LWO

Model 205, 213, 238, 253 

with code B01 (48V technology) 

G12938343Courtesy of MERCEDES-BENZ USA
G12938344Courtesy 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. AS00.00-Z-0009-01A
  Risk of fire  /risk of explosion due to short circuit and escaping oxyhydrogen gas. Risk of (burn) injury caused by caustic burns to eyes, skin and mucous membranes from battery electrolyte/mist, short circuit and arcing. Risk of poisoning  caused by swallowing battery electrolyte or absorption of lead through the skin or body orifices. Risk of death  due to voltage U >= 30 V AC and U >= 60 V DC. No fires, sparks, open flames, or smoking. Wear acid-resistant gloves, clothing, and glasses. Pour battery acid only into suitable and appropriately marked containers. AS54.10-Z-0001-01A
  Notes on self-locking nuts and bolts   AH00.00-N-0001-01A
  Information on preventing damage to electronic components due to electrostatic discharge   AH54.00-P-0001-01A
  Notes on battery   AH54.10-P-0001-01A
  Notes on safety-relevant components   AH00.00-Z-0019-01A
REMOVING Remove     
1 Detach ground line of on-board electrical system battery. Model 205, 213, 253
with code B01 (48V technology)		 AR54.10-P-0003LW
    Model 238
with code B01 (48V technology)		 AR54.10-P-0003LWO
2 Remove dust filter with air duct segment.    
REFER TO MAINTENANCE   Model 205
with code B01 (48V technology)		 AP83.00-P-8381B
REFER TO MAINTENANCE   Model 213, 238, 253
with code B01 (48V technology)		 AP83.00-P-8381C
3 Disconnect electrical connectors (1).    
4 Unscrew nuts (2) and remove electric lines (3) from DC/DC converter control unit (N83/1).    
5 Unscrew screw/bolts (4).    
6 Disconnect DC/DC converter control unit (N83/1) from 48 V on-board electrical system battery (G1/3). NOTES
The DC/DC converter control unit (N83/1) must be detached from the 48 V on-board electrical system battery (G1/3) vertically.
Otherwise the contact pin (16) will be damaged.
IMPORTANT Make sure that the DC/DC converter control unit (N83/1) is not tilted.
The DC/DC converter control unit (N83/1) is bonded to the 48 V on-board electrical system battery (G1/3) by means of the thermal compound.		  
INSPECT Check     
7 Check contact pin (16) and associated contact sleeve in DC/DC converter control unit (N83/1) for damage. If damage is present,
↓ 
Replace 48 V on-board electrical system battery (G1/3) or DC/DC converter control unit (N83/1).		  
      AR54.10-P-0022LWO
8 Check thread (7) for damage. If damage is present,
↓ 
Recut corresponding threads (7).		  
9 Check seal (8) for damage. If damage is present,
↓ 
Replace seal (8).		  
10 Check contact surface of 48 V on-board electrical system battery (G1/3) for damage. If damage is present,
↓ 
Replace 48 V on-board electrical system battery (G1/3).		  
      AR54.10-P-0022LWO
11 Check contact surface of DC/DC converter control unit (N83/1) for damage. If damage is present,
↓ 
Replace DC/DC converter control unit (N83/1).		  
CLEAN Clean     
12 Thoroughly clean contact surface of 48 V onboard electrical system battery (G1/3). When reusing 48 V on-board electrical system battery (G1/3).
IMPORTANT Use a commercially available plastic spatule for cleaning.		  
13 Thoroughly clean contact surface of DC/DC converter control unit (N83/1). When reusing the DC/DC converter control unit (N83/1).  
    IMPORTANT Use a commercially available plastic spatula for cleaning.  
INSTALLING Install     
14 Apply thermal compound to contact surface of DC/DC converter control unit (N83/1).   AR54.10-P-1351-01LWO 
    IMPORTANT The thermal compound must be processed with a period of 1 h.
IMPORTANTCommercially available devices/tools 
50 ml double-cartridge gun		  
    Thermal compound *BR00.45-Z-1002-14A 
15 Place DC/DC converter control unit (N83/1) onto 48 V on-board electrical system battery (G1/3) and press down evenly.    
16 Tighten bolts (4) TORQUE SPECIFICATION Bolt, DC/DC converter control unit to onboard electrical system battery (48V) *BA54.10-P-1011-01A 
17 Connect electric lines (3) to DC/DC converter control unit (N83/1) and tighten with nuts (2). TORQUE SPECIFICATION Nut, positive line/ground line to DC/DC converter control unit/on-board electrical system battery (48V) *BA54.10-P-1012-01A 
18 Connect electrical connectors (1).    
19 Install dust filter with air duct segment.    
REFER TO MAINTENANCE   Model 213, 238, 253
with code B01 (48V technology)		 AP83.00-P-8381C
REFER TO MAINTENANCE   Model 205
with code B01 (48V technology)		 AP83.00-P-8381 B
20 Connect ground line of on-board electrical system battery. Model 238
with code B01 (48V technology)		 AR54.10-P-0003LWO
    Model 205, 213, 253
with code B01 (48V technology)		 AR54.10-P-0003LW
BATTERY

Number Designation Model 205 Model 213
BA54.10-P-1011-01A Bolt, DC/DC converter control unit to onboard electrical system battery (48V) M5 Nm 6 6
BATTERY

Number Designation Model 238 Model 253
BA54.10-P-1011-01A Bolt, DC/DC converter control unit to on board electrical system battery (48V) M5 Nm 6 6
BATTERY

Number Designation Model 205 Model 213
BA54.10-P-1012-01A Nut, positive line/ground line to DC/DC converter control unit/on-board electrical system battery (48V) M8 Nm 16 16
BATTERY

Number Designation Model 238 Model 253
BA54.10-P-1012-01A Nut, positive line/ground line to DC/DC converter control unit/on-board electrical system battery (48V) M8 Nm 16 16
REPAIR MATERIALS

Number Designation Order number
BR00.45-Z-1002-14A Thermal compound A 222 989 00 00
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