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

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 up to 5/31/19

GROUND POINTS

Number	Designation			Model 253 (except 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)
BA00.19-P-1040-01E	Upper right liftgate ground point	W8/12	Nm	10

Fig 1: Identifying New Passenger Car Wiring Harness Repair Kit (220 589 04 99 00)

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Fig 2: Identifying Wiring Harness Repair Kit, Basic (000 589 13 99 00)

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REPAIR MATERIALS

Number	Designation	Order number
BR00.45-Z-1010-06A	Lubricant, rubber assembly 1 l	A 000 989 03 67

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Connection scheme

Routing diagram shown on model 253.9

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Courtesy of MERCEDES-BENZ USA

Connect black 24-pin connector (20.1) of trailer hitch wiring harness (20) to trailer recognition control unit (N28/1).
The black 24-pin connector (20.1) was routed into the vehicle interior during installation of the trailer hitch crossmember.
Connect white 6-pin connector of trailer hitch wiring harness (20) to the white 6-pin connector of control unit wiring harness (22).
This makes the electrical connection for the vehicle interior/trailer hitch (X58/33).
Use retaining clip to fasten electrical connection for vehicle interior/trailer hitch (X58/33) onto rear center section.

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Connect black 6-pin connector (22.2) to trailer recognition control unit (N28/1).
Connect black 10-pin connector (22.3) to trailer recognition control unit (N28/1).
Connect white 10-pin connector (22.4) to trailer recognition control unit (N28/1).
Route control unit wiring harness (22) along the existing lines to the rear fuse and relay module (K40/5) and secure using cable ties.
Fit brown fuse holder (22.1) onto rear fuse and relay module (K40/5) and check fuse assignment.
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.
Route white 4-pin connector (22.5) to rear SAM control unit (N10/8) and connect.

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Route brown/white line (BN/WH) to right rear wheel arch ground point (W3/8) and connect .
Route liftgate switch branch-off line (22.8) along the right D-pillar to headliner.
Release left cable duct (arrow).
Remove lines of connector (22.6) from liftgate switch branch-off line (22.8) with the basic wiring harness repair kit or with the supplementary wiring harness repair kit for passenger cars.
Note down contact cavity assignments.
Route liftgate switch branch-off line (22.8) into the liftgate above the headliner through the left cable duct (arrow).
Wrap liftgate switch branch-off line (22.8) in the area around the headliner with felt tape.

Use pull-through device and lubricant for rubber installation.

The headliner does not need to be detached.

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Install lines into connector (22.6).
Observe previously noted contact cavity assignments.
Wrap liftgate switch branch-off line (22.8), for a length of 400 mm starting at the black 6-pin connector (22.6), with felt tape.
Route liftgate switch branch-off line (22.8) along the vehicle wiring harness as shown.
Connect the brown line (br) to right upper liftgate ground point (W8/12) .
Cut off excess length of brown line (BN) and fit a commercially available round cable lug.

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Fasten liftgate switch branch-off line (22.8) to vehicle wiring harness using cable ties.
Strap down excess length of line.

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