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Retrofit Trailer Hitch Wiring Harness - AN31.19-P-8100-05LWI

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 253.3/9 as of 6/1/19 up to 5/31/20 

Notice  Notes on retrofitting electrical/optical lines   AH82.00-P-0000-01A
Notice  Notes on the use of paint scraping nuts on ground connections   AH00.19-P-1000-20A
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
GROUND POINTS

Number Designation Model 253 (except 253.99) as of model year 2020 Model 253 (except 253.99) up to model year 2020
BA00.19-P-1005-01E Right rear wheel well ground point W3/8 Nm 10 10
GROUND POINTS

Number Designation Model 253.99
BA00.19-P-1005-01E Right rear wheel well ground point W3/8 Nm 10
GROUND POINTS

Number Designation Model 253 (except 253.99) as of model year 2020 Model 253 (except 253.99) up to model year 2020
BA00.19-P-1016-01E Left front footwell ground point W15/5 Nm 10 10
GROUND POINTS

Number Designation Model 253.99
BA00.19-P-1016-01E Left front footwell ground point W15/5 Nm 10
GROUND POINTS

Number Designation Model 253 (except 253.99) as of model year 2020 Model 253 (except 253.99) up to model year 2020
BA00.19-P-1017-01E Left front footwell ground point (CAN) W15/6 Nm 10 10
GROUND POINTS

Number Designation Model 253.99
BA00.19-P-1017-01E Left front footwell ground point (CAN) W15/6 Nm 10
GROUND POINTS

Number Designation Model 253 (except 253.99) as of model year 2020 Model 253 (except 253.99) up to model year 2020
BA00.19-P-1028-01E Left footwell ground point W34 Nm 10 10
GROUND POINTS

Number Designation Model 253.99
BA00.19-P-1028-01E Left footwell ground point W34 Nm 10
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
G14470325Courtesy of MERCEDES-BENZ USA
G14470326Courtesy of MERCEDES-BENZ USA
  1. Attach black, 24-pin connector (20.1) of the trailer hitch wiring harness (20) to the trailer recognition control unit (N28/1).

    IMPORTANT The black, 24-pin connector (20.1) was routed into the vehicle interior compartment during installation of the trailer hitch cross member.

  2. Connect white 6-pin connector of trailer hitch wiring harness (20) to white 6-pin plug of control unit wiring harness (22).

    IMPORTANT This makes the electrical connection for the vehicle interior/trailer hitch (X58/33).

  3. Fasten vehicle interior/trailer hitch electrical connector (X58/33) to holder using retaining clip.
    G14470327Courtesy of MERCEDES-BENZ USA
  4. Connect black 10-pin connector (22.1) to trailer recognition control unit (N28/1).
  5. Connect black 10-pin connector (22.2) to trailer recognition control unit (N28/1).
  6. Route control unit wiring harness (22) along existing lines to right rear wheel well and fasten with cable ties.
    G14470327Courtesy of MERCEDES-BENZ USA
  7. 7.1  If a violet fuse holder (22.5) is not yet installed. Attach violet fuse holder (22.5) of control unit wiring harness (22) to slot "S17" on rear fuse and relay module (K40/5).

    IMPORTANT The slot "S17" is labeled.

    7.2  If a violet fuse holder (22.5) is already installed. Transfer fuses and lines on violet fuse holder (22.5) using basic SPECIAL TOOL wiring harness repair kit or supplementary passenger car SPECIAL TOOL wiring harness repair kit.

  8. Check fuse assignment on violet fuse holder (22.5); correct if necessary.

    IMPORTANTFuse assignment: 

    Contact cavity 6 = 15 A

    G12817595Courtesy of MERCEDES-BENZ USA
  9. 9.1  If a green fuse holder (22.6) is not yet installed. Attach green fuse holder (22.6) of control unit wiring harness (22) to slot "S18" on rear fuse and relay module (K40/5).

    IMPORTANT The slot "S18" is labeled.

    9.2  If a green fuse holder (22.6) is already installed. Transfer fuses and lines on green fuse holder (22.6) using basic SPECIAL TOOL wiring harness repair kit or supplementary passenger car SPECIAL TOOL wiring harness repair kit.

  10. Check fuse assignment on green fuse holder (22.6); correct if necessary.

    IMPORTANTFuse assignment: 

    Contact cavity 2 = 15 A

    Contact cavity 5 = 15 A

  11. Remove blue fuse holder (22.11) from slot "S2" of rear fuse and relay module (K40/5) and install red line (RD) of control unit wiring harness (22) in contact cavity 5 of blue fuse holder (22.11).
  12. Install blue fuse holder (22.11) at slot "S2" of rear fuse and relay module (K40/5).

    IMPORTANTFuse assignment: 

    Contact cavity 5 = 25 A

  13. Remove violet fuse holder (22.10) from slot "S15" of rear fuse and relay module (K40/5) and install red/yellow line (RD/YE) of control unit wiring harness (22) in contact cavity 3 of violet fuse holder (22.10).
  14. Install violet fuse holder (22.10) at slot "S15" of rear fuse and relay module (K40/5).

    IMPORTANTFuse assignment: 

    Contact cavity 3 = 25 A

  15. Route white 4-pin connector (23) to rear SAM control unit (N10/8) and connect.
  16. Route control unit wiring harness (22) to right D-pillar.
  17. Route brown/white line (BN/WH) to right rear wheel arch ground point (W3/8) and connect TORQUE SPECIFICATION .

    IMPORTANT A maximum of 4 round cable lugs may be connected per ground point. If too many have been used, select another ground point that has not been used.

    G14470330Courtesy of MERCEDES-BENZ USA
  18. Route front footwell branch-off line (22.4) along existing lines to right B-pillar and fix in place using cable ties.
    G12817607Courtesy of MERCEDES-BENZ USA
  19. Route red/blue line (RD/BU) of front footwell branch-off line (22.4) to front passenger side A-pillar fuse box (F1/3) and fix in place using cable ties.
  20. Route front footwell branch-off line (22.4) into driver footwell and fix in place with cable ties.
    G12817608Courtesy of MERCEDES-BENZ USA
  21. Remove violet multiple fuse carrier (80) of front passenger side A-pillar fuse box (F1/3).
  22. Install red/blue line (RD/BU) in contact cavity 1 of violet multiple fuse carrier (80) of front passenger side A-pillar fuse box (F1/3).

    IMPORTANT The contact cavities of the violet multiple fuse carrier (80) are labeled.

  23. Install violet multiple fuse carrier (80) of front passenger side A-pillar fuse box (F1/3).
  24. Insert a fuse with a fuse rating of 30 A into contact cavity 1 of violet multiple fuse holder (80).

    IMPORTANT Contact cavity 1 of violet multiple fuse carrier (80) is labeled on the outside with "F307".

    G12817609Courtesy of MERCEDES-BENZ USA
  25. Connect brown line (BN) of front footwell branch-off line (22.4) to front left footwell ground point (W15/5) TORQUE SPECIFICATION .

    IMPORTANT A maximum of 5 round cable lugs may be connected per ground point.

    If left front footwell ground point (W15/5) is overassigned,

    ↓

    Left front footwell ground point (CAN) (W15/6) TORQUE SPECIFICATION or left footwell ground point (W34) TORQUE SPECIFICATION to be used.

  26. Route green 4-pin coupling of front footwell branch-off line (22.4) to driver-side A-pillar and fix in place using cable ties.

    IMPORTANT The green 4-pin coupling is used to prepare the electrical connector for the electronic brake system (X58/28) with an approved electric brake control.

    G14470312Courtesy of MERCEDES-BENZ USA
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