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

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Model 253.3/9 as of 6/1/20 

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
G14470335Courtesy of MERCEDES-BENZ USA
G14470336Courtesy 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 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. 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. 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.

  8. 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
  9. Route white 4-pin connector (23) to rear SAM control unit (N10/8) and connect.
  10. Route control unit wiring harness (22) to right D-pillar.
  11. 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
  12. 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
  13. 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.
  14. Route front footwell branch-off line (22.4) into driver footwell and fix in place with cable ties.
    G12817608Courtesy of MERCEDES-BENZ USA
  15. Remove violet multiple fuse holder (80) of front passenger side A-pillar fuse box (F1/3).
  16. Install red/blue line (RD/BU) in contact cavity 1 of violet multiple fuse holder (80) of front passenger side A-pillar fuse box (F1/3).

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

  17. Install violet multiple fuse holder (80) of front passenger side A-pillar fuse box (F1/3).
  18. 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 holder (80) is labeled on the outside with "F307".

    G12817609Courtesy of MERCEDES-BENZ USA
  19. 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.

  20. 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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