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Home >> Mercedes Benz >> 2019 >> C300 4Matic, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 311 (Frame, Trailer Operation - 253 Chassis) >> Retrofitting & Conversion >> Replace Fan Unit Wiring Harness >> Replace Fan Unit Wiring Harness - AN31.19-P-8100-07LWL

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

WARNING: This page is about a different car, the 2023 Mercedes-Benz GLC300, 2022 Mercedes-Benz GLC300, 2021 Mercedes-Benz GLC300, 2020 Mercedes-Benz GLC350e, and 2020 Mercedes-Benz GLC300. However, it is still accessible from the selected car via links, so may be relevant.

Model 238.318/358/359/380/385/386/387 

Model 238.418/458/459/480/485/487 

Model 253.313/315/316/353/913/914/915/916/953 as of 6/1/19 

Model 253.380/381/384/980/981/983/984 as of 6/1/19 

Topical note  Notes on retrofitting electrical/optical lines   AH82.00-P-0000-01A
Topical note  Information on preventing damage to electronic components due to electrostatic discharge   AH54.00-P-0001-01A
Topical note  Notes on the use of paint scraping nuts on ground connections   AH00.19-P-1000-20A
GROUND POINTS

Number Designation Model 253 (except 253.99) as of model year 2020
BA00.19-P-1003-01E Left front ground point W2/2 Nm 10
GROUND POINTS

Number Designation Model 238
BA00.19-P-1003-02B Left front ground point (Electrical Power Steering) W2/2 Nm 10
FUSE AND RELAY BOX

Number Designation Model 238 Model 253
BA54.15-P-1003-01K Nut, positive line to engine compartment prefuse box M6 Nm 8 8
M8 Nm 16 16
Fig 1: Identifying New Passenger Car Wiring Harness Repair Kit (220 589 04 99 00)
G13743265Courtesy of MERCEDES-BENZ USA
Fig 2: Identifying Wiring Harness Repair Kit, Basic (000 589 13 99 00)
G12618300Courtesy of MERCEDES-BENZ USA

Routing diagram shown on model 253.9 

G14470357Courtesy of MERCEDES-BENZ USA
  1. Wrap fan unit wiring harness (33) with felt tape, starting at the branch-off line of the brown line (BN).
  2. Detach black 4-pin connector (30) from fan motor.
    G12817624Courtesy of MERCEDES-BENZ USA
  3. Mark contact cavity assignment of black 4-pin coupling housing (30.1).
  4. Remove contact spring (31) of brown line of vehicle wiring harness from black 4-pin coupling housing (30.1).

    IMPORTANT The appropriate tool is available in the SPECIAL TOOL basic wiring harness repair kit or the SPECIAL TOOL supplementary passenger car wiring harness repair kit.

  5. Remove contact spring (32) of red line of vehicle wiring harness from black 4-pin coupling housing (30.1).

    IMPORTANT The appropriate tool is available in the SPECIAL TOOL basic wiring harness repair kit or the SPECIAL TOOL supplementary passenger car wiring harness repair kit.

  6. Cut off contact springs (31, 32) of vehicle wiring harness.
  7. Tie back brown line of vehicle wiring harness and insulate.
  8. Tie back red line of vehicle wiring harness and insulate.
    G12817625Courtesy of MERCEDES-BENZ USA
  9. Detach brown line of vehicle wiring harness from left front ground point (W2/2).
  10. Cut line lug off brown line of vehicle wiring harness.
  11. Tie back brown line of vehicle wiring harness and insulate.
    G12817626Courtesy of MERCEDES-BENZ USA
  12. Route brown line (BN) of fan unit wiring harness (33) to left front ground point (W2/2) and connect Model 253.313/315/316/353/913/914/915/916/953 as of 6/1/19

    as of model year 2020

    Model 253.380/381/384/980/981/984 as of 6/1/19

    as of model year 2020

    TORQUE SPECIFICATION Model 238.318/358/359/380/385/386/387

    Model 238.418/458/459/480/485/487 TORQUE SPECIFICATION .

    G12817627Courtesy of MERCEDES-BENZ USA
  13. Install contact spring (33.2) of brown line (BN) of fan unit wiring harness (33) into black 4-pin coupling housing (30.1).

    NOTES Ensure that seal is correctly seated.

    Otherwise water could enter which could then cause a short circuit or corrosion.

    IMPORTANT The contact cavity assignment was marked previously.

  14. Install contact spring (33.1) of red line (RD) of fan unit wiring harness (33) into black 4-pin coupling housing (30.1).

    NOTES Ensure that seal is correctly seated.

    Otherwise water could enter which could then cause a short circuit or corrosion.

    IMPORTANT The contact cavity assignment was marked previously.

    G12817628Courtesy of MERCEDES-BENZ USA
  15. Route red line (RD) of fan unit wiring harness (33) along existing lines to engine compartment prefuse box (F32/3).

    NOTES Make sure that movement of the wiper arms is unobstructed.

    Otherwise the red line (RD) can be sheared off, thereby causing a short circuit.

    G12817629Courtesy of MERCEDES-BENZ USA
  16. Detach red line of vehicle wiring harness from contact cavity 3  (arrow) of engine compartment prefuse box (F32/3).
  17. Cut line lug off red line of vehicle wiring harness.
  18. Tie back red line of vehicle wiring harness and insulate.
  19. Attach red line (RD) of fan unit wiring harness (33) to contact cavity 3  (arrow) of engine compartment prefuse box (F32/3) TORQUE SPECIFICATION .
    G12817630Courtesy of MERCEDES-BENZ USA
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