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

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Model 253.3/9 as of 6/1/20 

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 253.99
BA00.19-P-1053-01E Right D-pillar ground point W29/9 Nm 10
G14470287Courtesy of MERCEDES-BENZ USA

Connection scheme 

Routing diagram 

G14470288Courtesy 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 blue 6-pin coupling of trailer hitch wiring harness (20) to blue 6-pin contact 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 coupling (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. Connect white, 10-pin coupling (22.3) to the 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. Fit brown fuse holder (22.5) of wiring harness for control unit (22) into "S14" slot on rear fuse and relay module (K40/5).

    IMPORTANT Slot "S14" on the rear fuse and relay module (K40/5) is labeled.

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

    IMPORTANT Fuse assignment:

    Contact cavity 1 = 30A

    Contact cavity 2 = 20A

    Contact cavity 3 = 30A

    Contact cavity 4 = 30A

    Contact cavity 5 = 20A

    G14470291Courtesy of MERCEDES-BENZ USA
  10. Route white 4-pin coupling (22.4) to rear SAM control unit (N10/8) and connect.
  11. Route control unit wiring harness (22) to right D-pillar.
  12. 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
  13. Route brown line (BN) to right D-pillar ground point (W29/9) and connect Model 253.99 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.

  14. Release cable duct (23).
  15. 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
  16. 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
  17. Route tailgate fully electric trailer hitch switch branch-off line (22.8) of control unit wiring harness (22) to installation location of trunk/tailgate fully electric trailer hitch switch (S142/2) along vehicle wiring harness.

    IMPORTANT The black 6-pin coupling (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.

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