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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 >> Retrofit Trailer Hitch Wiring Harness >> (Retrofit Trailer Hitch Wiring Harness - AN31.19-P-8100-05LWG)

(Retrofit Trailer Hitch Wiring Harness - AN31.19-P-8100-05LWG)

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 253.9 up to 5/31/19 

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

Connection scheme 

G14470304Courtesy of MERCEDES-BENZ USA

Routing diagram 

G14470305Courtesy 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 for the trailer hitch wiring harness (20) to the white, 6-pin connector for the control unit wiring harness (22).

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

  3. Use retaining clip to fasten electrical connection for vehicle interior/trailer hitch (X58/33) onto rear center section.
    G12817604Courtesy of MERCEDES-BENZ USA
    G12817605Courtesy of MERCEDES-BENZ USA
  4. Connect black 6-pin connector (22.2) to trailer recognition control unit (N28/1).
  5. Connect black, 10-pin connector (22.3) to trailer recognition control unit (N28/1).
  6. Route control unit wiring harness (22) along the existing lines to the right rear wheel well and fasten with cable ties.
  7. Fit brown fuse holder (22.1) onto rear fuse and relay module (K40/5) and check fuse assignment.

    IMPORTANT Fuse assignment:

    Contact cavity 1  = 25 A

    Contact cavity 2  = 15 A

    Contact cavity 3  = 25 A

    Contact cavity 4  = 30 A

    Contact cavity 5  = 15 A

    The brown fuse holder contact cavities (22.1) are labeled.

  8. Route white, 4-pin connector (22.5) to rear SAM control unit (N10/8) and connect.
  9. Route brown/white line (BN/WH) of control unit wiring harness (22) to rear right wheel arch ground point (W3/8) and connect TORQUE SPECIFICATION .
    G12817606Courtesy of MERCEDES-BENZ USA
  10. Route front footwell branch-off line (22.4) along existing lines to the B-pillar and fix in place using cable ties.
    G12817607Courtesy of MERCEDES-BENZ USA
  11. Route red/blue line (RD/BU) for front footwell branch-off line (22.4) to fuse box on right A-pillar (F1/3) and fix in place using cable ties.
  12. Route front footwell branch-off line (22.4) into driver footwell and fix in place with cable ties.
    G12817608Courtesy of MERCEDES-BENZ USA
  13. Remove violet multiple fuse carrier (80) from fuse box on right A-pillar (F1/3).
  14. Install red/blue line (RD/BU) into contact cavity8 of the violet multiple fuse carrier (80) of fuse box on right A-pillar (F1/3).

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

  15. Install violet multiple fuse carrier (80) into fuse box on right A-pillar (F1/3).
  16. Insert a fuse with a fuse rating of 30 A into contact cavity "8  " of the violet multiple fuse holder (80).

    IMPORTANT Contact cavity 8  of the violet multiple fuse carrier (80) is labeled on the outside with F308  .

    G12817609Courtesy of MERCEDES-BENZ USA
  17. 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.

    If more than 5 round cable lugs are connected,

    ↓

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

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

    IMPORTANT The green 4-pin coupling is used to establish the electrical connection of the electronic brake system (X58/28) to an approved electric brake controller.

    G14470312Courtesy of MERCEDES-BENZ USA
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