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Home >> Mercedes Benz >> 2025 >> GLA250 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Frame, Trailer Operation -- 118 Chassis) >> Retrofitting & Conversion >> Replace Fan Unit Wiring Harness - AN31.19-P-8100-07MFA

Replace Fan Unit Wiring Harness - AN31.19-P-8100-07MFA

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Model 118, 177, 247 

WARNING Risk of injury.  Skin or eye injuries may result when handling hot or glowing objects. Wear protective gloves, protective clothing and safety glasses, if necessary. AS00.00-Z-0002-01A
CAUTION Risk of injury  caused by burns to skin and eyes. Risk of poisoning  caused by inhaling fumes when working with heat-shrinkable tubing. Work in well ventilated rooms only. Wear safety glasses with side protection and protective gloves. AS00.19-Z-0001-01A
CAUTION Risk of injury  caused by burns to skin and eyes, risk of poisoning caused by inhaling fumes during soldering. Wear protective gloves, protective clothing and safety glasses. Ensure that the work area is adequately ventilated. Secure power supply cables. Avoid sources of fire in working area. AS00.19-Z-0002-01A
Notice  Notes on the use of paint scraping nuts on ground connections   AH00.19-P-1000-20A
  Notes on safety-relevant components   AH00.00-Z-0019-01A
GROUND POINTS

Number Designation Model 118 Model 177
BA00.19-P-1004-02E Fan motor ground point W2/2 M6 Nm 10 10
GROUND POINTS

Number Designation Model 247
BA00.19-P-1004-02E Fan motor ground point W2/2 M6 Nm 10
FUSE AND RELAY BOX

Number Designation Model 118 Model 177
BA54.15-P-1001-01M Nut, positive line to pre-fuse box M6 Nm 8 8
M8 Nm 16 16
FUSE AND RELAY BOX

Number Designation Model 247
BA54.15-P-1001-01M Nut, positive line to pre-fuse box M6 Nm 8
M8 Nm 16
Fig 1: Identifying Welding Bead Catcher (129 589 01 98 00)
G12618933Courtesy of MERCEDES-BENZ USA
Fig 2: Identifying New Passenger Car Wiring Harness Repair Kit (220 589 04 99 00)
G16047559Courtesy of MERCEDES-BENZ USA
Fig 3: Identifying Adapter (220 589 01 99 42)
G13654445Courtesy of MERCEDES-BENZ USA
Fig 4: Identifying Wiring Harness Repair Kit, Basic (000 589 13 99 00)
G16065040Courtesy of MERCEDES-BENZ USA
Fig 5: Identifying Wire Stripper (220 589 01 99 40)
G12619004Courtesy of MERCEDES-BENZ USA
Fig 6: Identifying Reflector (220 589 01 99 41)
G12618303Courtesy of MERCEDES-BENZ USA

IMPORTANT The following operation steps are shown on vehicles with engine 282.

Connection scheme 

G16049925Courtesy of MERCEDES-BENZ USA

Connection scheme 

G16049926Courtesy of MERCEDES-BENZ USA
  1. Stick felt tape onto red line (RD) of electric fan wiring harness (25).
  2. Insulate blue/yellow line (BU/YE) and red/blue line (RD/BU) of electric fan wiring harness (25) and strap down.
    G15488917Courtesy of MERCEDES-BENZ USA
  3. Remove black 4-pin coupling (34) from fan motor (M4/7).
  4. Remove brown line (34.8) of vehicle wiring harness from fan motor ground point (W2/2).
    G15488918Courtesy of MERCEDES-BENZ USA
  5. Cut off all lines (34.5, 34.6, 34.7, 34.8) of vehicle wiring harness on black 4-pin coupling housing (34).

    IMPORTANT The black 4-pin coupling housing (34) is no longer required.

  6. Insulate brown line (34.8) of vehicle wiring harness and strap down.
  7. Insulate red line (34.7) of vehicle wiring harness and strap down.
    G15488919Courtesy of MERCEDES-BENZ USA
  8. Cut through blue/yellow line (BU/YE) and red/blue line (RD/BU) of electric fan wiring harness (25).

    IMPORTANT Cut through blue/yellow line (BU/YE) and red/blue line (RD/BU) approx. 100 mm behind black 4-pin clutch housing (25.3).

    G15488920Courtesy of MERCEDES-BENZ USA
  9. Strip blue/yellow line (34.5) of vehicle wiring harness and blue/yellow line (25.5) of electric fan wiring harness (25) using SPECIAL TOOL wire stripper, and connect to each other using end sleeve (27).

    IMPORTANT The end sleeve (27) is available in the SPECIAL TOOL basic wiring harness repair kit or the SPECIAL TOOL supplementary wiring harness repair kit for passenger cars.

    To do so, use the SPECIAL TOOL welding pearl catcher, the SPECIAL TOOL reflector and the SPECIAL TOOL adapter.

  10. Strip red/blue line (34.6) of vehicle wiring harness and red/blue line (25.6) of electric fan wiring harness (25) using SPECIAL TOOL wire stripper, and connect to each other using end sleeve (27).

    IMPORTANT The end sleeve (27) is available in the SPECIAL TOOL basic wiring harness repair kit or the SPECIAL TOOL supplementary wiring harness repair kit for passenger cars.

    To do so, use the SPECIAL TOOL welding pearl catcher, the SPECIAL TOOL reflector and the SPECIAL TOOL adapter.

  11. Insulate blue/yellow line (BU/YE) and red/blue line (RD/BU) of electric fan wiring harness (25) and strap down.
    G15488921Courtesy of MERCEDES-BENZ USA
  12. Wrap fabric tape around end sleeves (27) (99) and fasten to electric fan wiring harness (25).
    G15488922Courtesy of MERCEDES-BENZ USA
  13. Attach black 4-pin clutch housing (25.3) to fan motor (M4/7).
  14. Attach brown line (BN) of electric fan wiring harness (25) to fan motor ground point (W2/2) TORQUE SPECIFICATION .
  15. Route red line (RD) of electric fan wiring harness (25) at vehicle wiring harness to engine compartment pre-fuse box (F150/3) and secure with cable ties.
    G15488923Courtesy of MERCEDES-BENZ USA
  16. Route red line (RD) of electric fan wiring harness (25) at vehicle wiring harness behind holder (5) up to engine compartment pre-fuse box (F150/3), and secure with cable ties.
  17. Remove cable tie (arrow A) of red line of vehicle wiring harness from engine compartment pre-fuse box (F150/3).
  18. Detach red line of vehicle wiring harness from contact cavity A5 (arrow B) of engine compartment pre-fuse box (F150/3).
  19. Cut line lug off red line of vehicle wiring harness.
  20. Insulate red line of vehicle wiring harness and strap down.
    G15488924Courtesy of MERCEDES-BENZ USA
  21. Attach red line (RD) of electric fan wiring harness (25) to contact cavity A5 (arrow B) of engine compartment pre-fuse box (F150/3) TORQUE SPECIFICATION .
  22. Attach red line (RD) of electric fan wiring harness (25) to engine compartment pre-fuse box (F150/3) using new cable ties (arrow A).
G15488925Courtesy of MERCEDES-BENZ USA
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