Retrofit trailer hitch

AN31.10-S-8080E

Retrofit trailer hitch

16.07.2019

Model

447

with code E57 (Electrics for trailer socket)

except code 771L (Argentina version)

except code 775L (Brazil version)

except code 777L (Chile version)

except code XM0 (Facelift)

Modification notes

15.07.2019

Method extended and document revised

Operation steps 5, 6, 7, 8, 9

AN31.19-S-8100-05E

Shown on model 447.8 with code Q50 (Trailer hitch with removable ball head)

1

Stowage compartment cover

2

Trailer hitch crossmember

N28/1

Trailer recognition (AAG) control unit

3

Vehicle tool kit mount

4

Screw

 Danger

Risk of death caused by vehicle slipping or toppling off of the lifting platform.

Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer.

AS00.00-Z-0010-01A

Topical note

Notes on installing a trailer hitch

AH31.10-P-1000-02B

Topical note

Special instructions for lifting and supporting vehicle

AH00.60-N-0100-01A

Topical note

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

Topical note

Notes on carrying out repair work in the vehicle interior

AH68.00-N-0001-01S



Remove

1

Detach ground line of on-board electrical system battery.



AR54.10-S-0003E

2

Remove stowage compartment cover (1).

Model 447.7 with code V23 (Interior trim, superior version) Model 447.8

3

Remove jack.

Model 447.7 with code RR6 (Spare wheel with vehicle jack) with code V23 (Interior trim, superior version) Model 447.7 with code V23 (Interior trim, superior version) with code Y36 (Vehicle jack) Model 447.8 with code RR6 (Spare wheel with vehicle jack) Model 447.8 with code Y36 (Vehicle jack)

4.1

Remove vehicle tool kit mount (3).

All vehicles with vehicle tool kit mount (3)



AR68.30-S-5020E

If the trailer hitch with removable ball head is to be retrofitted,



the vehicle tool kit mount (3) is replaced by the vehicle tool kit mount (3) from the parts kit and can be disposed of properly after removal.

4.2

Remove stowage compartment in right rear passenger compartment.

Model 447.7 with code V23 (Interior trim, superior version) except code E28 (Additional battery for retrofitted consumers) except code RR6 (Spare wheel with vehicle jack) except code SB6 (Comfort front passenger seat, swiveling) except code Y36 (Vehicle jack) except code ZG2 (Permanent all-wheel drive) Model 447.8 except code E65 (Burmester surround sound system) except code RR6 (Spare wheel with vehicle jack) except code SB6 (Comfort front passenger seat, swiveling) except code W68 (Electrically operated liftgate) except code Y36 (Vehicle jack) except code ZG2 (Permanent all-wheel drive) except code ZK7 (MARCO POLO equipment line)



AR68.00-S-0009E

If the trailer hitch with removable ball head is to be retrofitted,



the stowage compartment at the right in the rear passenger compartment is replaced by the vehicle tool kit mount (3) and can be disposed of properly after removal.

4.3

Remove rear right load compartment trim.

Model 447.6 except code E28 (Additional battery for retrofitted consumers) except code RR6 (Spare wheel with vehicle jack) except code Y36 (Vehicle jack) Model 447.7 except code E28 (Additional battery for retrofitted consumers) except code RR6 (Spare wheel with vehicle jack) except code SB6 (Comfort front passenger seat, swiveling) except code V23 (Interior trim, superior version) except code Y36 (Vehicle jack)



AR68.30-S-1180E

 Only remove the lower load compartment paneling.

4.4

Remove rear right side trim in rear passenger compartment.

Model 447.7 with code V23 (Interior trim, superior version) with code ZG2 (Permanent all-wheel drive) except code E28 (Additional battery for retrofitted consumers) except code RR6 (Spare wheel with jack) except code SB6 (Comfort front passenger seat, swiveling) except code Y36 (Jack) Model 447.8 with code ZK7 (MARCO POLO equipment line) except code RR6 (Spare wheel with jack) except code Y36 (Jack)



AR68.30-S-4780E

5

Remove rear bumper.



AR88.20-S-2200E

6

Remove carrier of rear bumper.



Model 447.7/8 with code Z42 (Registration as passenger car)

AR88.20-S-2250E

 The carrier is no longer required and can be disposed of properly after removal.

7

Remove towing eye from rear crossmember.



Model 447

AR64.20-S-1203E

 The towing eye is no longer required and can be disposed of properly after removal.



Install

8

Retrofit trailer hitch electrical wiring harness.

AN31.19-S-8100-05E

 The trailer recognition (AAG) control unit (N28/1) is also installed at the same time.

 M8

*BA00.10-N-1003-01A

 Long wedge

*115589035900

9

Install trailer hitch crossmember (2) with coupling ball.

AN31.11-S-8080-04E

 Screw/bolt, trailer hitch crossmember to longitudinal member

*BA31.10-N-1001-01J

10

Make bumper cutout retroactively.

AN31.11-S-8080-08E

 Commercially available devices/tools
Body saw

11

Install rear bumper.



AR88.20-S-2200E

12.1

Install rear right side trim in rear passenger compartment.

Model 447.7 with code V23 (Interior trim, superior version) with code ZG2 (Permanent all-wheel drive) except code E28 (Additional battery for retrofitted consumers) except code RR6 (Spare wheel with vehicle jack) except code SB6 (Comfort front passenger seat, swiveling) except code Y36 (Vehicle jack)
When retrofitting a trailer coupling with non-removable ball head.



AR68.30-S-1206E

12.2

Install stowage compartment in right rear passenger compartment.

Model 447.7 with code V23 (Interior trim, superior version) except code E28 (Additional battery for retrofitted consumers) except code RR6 (Spare wheel with vehicle jack) except code SB6 (Comfort front passenger seat, swiveling) except code Y36 (Vehicle jack) except code ZG2 (Permanent all-wheel drive)
When retrofitting a trailer coupling with non-removable ball head.



AR68.00-S-0009E

13

Install rear right load compartment trim.



Model 447.6 except code E28 (Additional battery for retrofitted consumers) except code RR6 (Spare wheel with vehicle jack) except code Y36 (Vehicle jack) Model 447.7 except code E28 (Additional battery for retrofitted consumers) except code RR6 (Spare wheel with vehicle jack) except code SB6 (Comfort front passenger seat, swiveling) except code V23 (Interior trim, superior version) except code Y36 (Vehicle jack)

AR68.30-S-1180E

If the trailer hitch with removable ball head is to be retrofitted,



the previously removed lower load compartment trim must be replaced by an appropriate version for the retrofit installation of the vehicle tool kit carrier (3).

14.1

Install vehicle tool kit mount (3).

All vehicles with vehicle tool kit mount (3)



AR68.30-S-5020E

If the trailer hitch with non-removable ball head is to be retrofitted,



use the previously removed vehicle tool kit mount (3).

If the trailer hitch with removable ball head is to be retrofitted,



use the vehicle tool kit mount (3) provided in the parts kit.

14.2

Retrofit vehicle tool kit mount (3) from parts kit.

All vehicles without existing vehicle tool kit mount (3)
When retrofitting a trailer coupling with removable ball head.

 To do this, secure the vehicle tool kit carrier (3) with screws (4).
Do not install the cap of the vehicle tool kit mount (3) yet.

15

Install jack.

Model 447.7 with code RR6 (Spare wheel with vehicle jack) with code V23 (Interior trim, superior version) Model 447.7 with code V23 (Interior trim, superior version) with code Y36 (Vehicle jack) Model 447.8 with code RR6 (Spare wheel with vehicle jack) Model 447.8 with code Y36 (Vehicle jack)

16

Install cap of vehicle tool kit mount (3).

All vehicles with retrofitted vehicle tool kit mount (3)
When retrofitting a trailer coupling with removable ball head.

17

Install rear right side trim in rear passenger compartment.

When retrofitting a trailer coupling with removable ball head.



Model 447.7 with code V23 (Interior trim, superior version) with retrofitted vehicle tool kit mount (3) model 447.8 with retrofitted vehicle tool kit mount (3)

AR68.30-S-4780E

18

Install stowage compartment cover (1).

Model 447.7 with code V23 (Interior trim, superior version) Model 447.8

19

Attach ground line of on-board electrical system battery.



AR54.10-S-0003E

20

Enter each special equipment item in Vehicle Documentation (VeDoc).

 Model 447
Designation of relevant special equipment: Code Q50 (Trailer hitch with removable ball head). The existing entry "Code E57 (Electrical system for trailer socket)" must be deleted.

 Model 447.6/7
Designation of relevant special equipment: Code Q22 (Trailer hitch with non-removable ball head). The existing CODE E57 (Electrical system for trailer socket) has to be removed.

21

Perform SCN coding on electronic ignition lock (EIS) control unit (N73).



AR54.21-S-0015E

 Under the menu item "Control unit adaptations", follow the instructions for "SCN coding".

 Do not yet remove vehicle diagnosis system.

22

Perform SCN coding on signal acquisition and actuation module (SAM) control unit (N10/1).



AR54.21-S-0015E

 Under the menu item "Control unit adaptations", follow the instructions for "SCN coding".

 Do not yet remove vehicle diagnosis system.

23

Perform SCN coding on radio (Audio) (N87/2) or radio (Audio/COMAND) (N87/6).



Model 447.6/7 with code EN6 (Audio 10) Model 447.6/7 with code EN7 (Audio 15) Model 447.8

AR54.21-S-0015E

 Under the menu item "Control unit adaptations", follow the instructions for "SCN coding".

 Do not yet remove vehicle diagnosis system.

24

Perform SCN coding on Electronic Stability Program (ESP) control unit (N30/4).



AR54.21-S-0015E

 Under the menu item "Control unit adaptations", follow the instructions for "SCN coding".

 Do not yet remove vehicle diagnosis system.

25

Perform SCN coding on Parktronic (PTS) control unit (N62).



Model 447.8 with code EZ6 (Parking package with 360° camera) Model 447 with code EZ5 (Parking package) Model 447 with code EZ7 (Active Parking Assist)

AR54.21-S-0015E

 Under the menu item "Control unit adaptations", follow the instructions for "SCN coding".

 Do not yet remove vehicle diagnosis system.

26

Perform SCN coding on gateway for user interface CAN (N93/4).



Model 447.8

AR54.21-S-0015E

 Under the menu item "Control unit adaptations", follow the instructions for "SCN coding".

 Do not yet remove vehicle diagnosis system.

27.1

Perform SCN coding on reversing camera (RFK) control unit (B84/3) or rear-end door reversing camera (RFK) control unit (B84/10) or on reversing camera (RFK) control unit (B84/5).

Model 447 with code FR8 (Reversing camera)



AR54.21-S-0015E

 Under the menu item "Control unit adaptations", follow the instructions for "SCN coding".

 Do not yet remove vehicle diagnosis system.

27.2

Perform SCN coding on 360° camera control unit (N153).

Model 447.8 with code EZ6 (Parking package with 360° camera) Model 447.8 with code JS1 (360° camera)



AR54.21-S-0015E

 Under the menu item "Control unit adaptations", follow the instructions for "SCN coding".



Check

28

Perform function check on trailer socket.

AN31.19-S-8100-06E



000 588 00 63 00 Test box

WS82.00-P-0027B

Convert electric fan

29.1

Remove standard-equipment electric fan and replace it with a 600 W electric fan.

Model 447.6##/7## ## up to 229681 with engine 622 with code HH4 (THERMOTRONIC automatic climate control) Model 447.6##/7## ## up to 229681 with engine 622 with code HH9 (Semi-automatically controlled air conditioning, TEMPMATIC) Model 447.6##/7## ## up to 229681 with engine 651 except code H09 (Air conditioning with increased output) except code HH4 (THERMOTRONIC automatic climate control) except code HH9 (Semi-automatically controlled air conditioning, TEMPMATIC)



Model 447.6##/7## ## up to 229681 with engine 622 with code HH4 (THERMOTRONIC automatic climate control) Model 447.6##/7## ## up to 229681 with engine 622 with code HH9 (Semi-automatically controlled air conditioning, TEMPMATIC)

AR20.40-S-5000EF



Model 447.6##/7## ## up to 229681 with engine 651 except code H09 (Air conditioning with increased output) except code HH4 (THERMOTRONIC automatic climate control) except code HH9 (Semi-automatically controlled air conditioning, TEMPMATIC)

AR20.40-S-5000E

 The removed electric fan is no longer used and can be disposed of properly.

29.2

Remove standard-equipment electric fan and replace it with a 850 W electric fan.

Model 447.6##/7## ## up to 229681 with engine 651 with code HH4 (THERMOTRONIC automatic climate control) except code H09 (Air conditioning with increased output) Model 447.6##/7## ## up to 229681 with engine 651 with code HH9 (Semi-automatically controlled air conditioning, TEMPMATIC) except code H09 (Air conditioning with increased output) Model 447.8## ## up to 229681 with engine 651 except code H09 (Air conditioning with increased output)



AR20.40-S-5000E

 The removed electric fan is no longer used and can be disposed of properly.

 Headless screws/bolts: screws/bolts and nuts, coarse-pitch thread

Number

Designation

8.8

10.9

BA00.10-N-1003-01A

M8

Galvanized

Nm

23

32

Phosphated

Nm

21

29

 Headless screws/bolts: screws/bolts and nuts, coarse-pitch thread

Number

Designation

12.9

BA00.10-N-1003-01A

M8

Galvanized

Nm

38

Phosphated

Nm

36

 Trailer hitch

Number

Designation

Model 447

BA31.10-N-1001-01J

Screw/bolt, trailer hitch crossmember to longitudinal member

Nm

90

Parts ordering note

Part no.

Designation

Quantity

KG99

Trailer hitch package contents

1