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Retrofit Wiring Harness For Fully Electric Swiveling Trailer Hitch - AN31.19-P-0010-03LWM

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Model 253.3/9 as of 6/1/19 up to 5/31/20 

Notice  Notes on the use of paint scraping nuts on ground connections   AH00.19-P-1000-20A
Notice  Notes on retrofitting electrical/optical lines   AH82.00-P-0000-01A
  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-1053-01E Right D-pillar ground point W29/9 Nm - -
GROUND POINTS

Number Designation Model 253.99
BA00.19-P-1053-01E Right D-pillar ground point W29/9 Nm 10
Fig 1: Identifying New Passenger Car Wiring Harness Repair Kit (220 589 04 99 00)
G13743246Courtesy of MERCEDES-BENZ USA
Fig 2: Identifying Wiring Harness Repair Kit, Basic (000 589 13 99 00)
G12618300Courtesy of MERCEDES-BENZ USA
G14470276Courtesy of MERCEDES-BENZ USA

Connection scheme 

Routing diagram 

G14470277Courtesy of MERCEDES-BENZ USA
  1. Attach black 24-pin contact socket (20.1) of trailer hitch wiring harness (20) to trailer recognition control unit (N28/1).

    IMPORTANT The black 24-pin contact socket (20.1) was routed into the vehicle interior during installation of the trailer hitch crossmember.

  2. Connect blue 6-pin contact socket of trailer hitch wiring harness (20) to blue 6-pin connector socket of control unit wiring harness (22).

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

  3. Fasten electrical connector for vehicle interior/trailer hitch (X58/33) to holder using retaining clip.
    G12817593Courtesy of MERCEDES-BENZ USA
  4. Connect black 6-pin contact socket (22.1) to trailer recognition control unit (N28/1).
  5. Connect black 10-pin contact socket (22.2) to trailer recognition control unit (N28/1).
  6. Connect white 10-pin contact socket (22.3) to trailer recognition control unit (N28/1).
  7. Route control unit wiring harness (22) along the existing lines to the right rear wheel well and fasten with cable ties.
    G12817593Courtesy of MERCEDES-BENZ USA
  8. 8.1  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 Slot "S17" on the rear fuse and relay module (K40/5) is labeled.

    8.2  If a violet fuse holder (22.5) is already installed as standard.

    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.

  9. Check fuse assignment on violet fuse holder (22.5), correct if necessary.

    IMPORTANT Fuse assignment:

    Contact cavity 5 = 15A

    Contact cavity 6 = 15A

    G12817595Courtesy of MERCEDES-BENZ USA
  10. 10.1  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 Slot "S18" on the rear fuse and relay module (K40/5) is labeled.

    10.2  If a green fuse holder (22.6) is already installed as standard.

    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.

  11. Check fuse assignment on green fuse holder (22.6), correct if necessary.

    IMPORTANT Fuse assignment:

    Contact cavity 1 = 5A

    Contact cavity 2 = 15A

    Contact cavity 3 = 5A

    Contact cavity 4 = 5A

    Contact cavity 5 = 15A

    Contact cavity 6 = 5A

    G12817595Courtesy of MERCEDES-BENZ USA
  12. Remove blue fuse holder (22.11) from slot "S2" on rear fuse and relay module (K40/5) and install red line of control unit wiring harness (22) into contact cavity 5 of blue fuse holder (22.11).
  13. Attach blue fuse holder (22.11) to slot "S2" on rear fuse and relay module (K40/5).

    IMPORTANT Fuse assignment:

    Contact cavity 5 = 25A

  14. Remove violet fuse holder (22.10) from slot "S15" on rear fuse and relay module (K40/5) and install red/yellow line of control unit wiring harness (22) into contact cavity 3 of violet fuse holder (22.10).
  15. Attach violet fuse holder (22.10) to slot "S15" on rear fuse and relay module (K40/5).

    IMPORTANT Fuse assignment:

    Contact cavity 3 = 25A

    G12817595Courtesy of MERCEDES-BENZ USA
  16. Route white 4-pin contact socket (22.4) to rear SAM control unit (N10/8) and connect.
  17. Route control unit wiring harness (22) to right D-pillar.
  18. 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. In the event of over-assignment, any free ground point should be selected.

    G12817598Courtesy of MERCEDES-BENZ USA
  19. Route brown line (BN) to right D-pillar ground point (W29/9) and connect TORQUE SPECIFICATION .

    IMPORTANT A maximum of 4 round cable lugs may be connected per ground point. In the event of over-assignment, any free ground point should be selected.

  20. Release cable duct (23).
  21. Wrap felt tape around liftgate fully electric trailer hitch switch branch-off line (22.8) of control unit wiring harness (22) in area of roof lining.
    G14470284Courtesy of MERCEDES-BENZ USA
  22. Route liftgate fully electric trailer hitch switch branch-off line (22.8) of control unit wiring harness (22) through cable duct (23) to liftgate.

    IMPORTANT Use a pull-through device in the area of the cable duct (23).

    G14470284Courtesy of MERCEDES-BENZ USA
  23. Route liftgate fully electric trailer hitch switch branch-off line (22.8) of control unit wiring harness (22) to installation location of trailer hitch switch along vehicle wiring harness.

    IMPORTANT The black 6-pin contact socket (22.9) must protrude far enough to enable the trunk/liftgate fully electric trailer hitch switch (S142/2) to be connected at a later stage.

  24. Fasten the liftgate full electric trailer hitch switch branch-off line (22.8) to the vehicle wiring harness using cable ties.
  25. Fasten cable duct (23).
    G14470286Courtesy of MERCEDES-BENZ USA
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