97090904 Loosening and securing main wire harness in luggage compartment

WM 970909 Loosening and securing main wire harness in luggage compartment

Information

The main wire harness is manufactured individually depending on equipment.
- Fastening elements may be different from the parts described.
- The number of plug connections can vary, depending on equipment.

Preliminary work

1. Remove the battery. -> 270619 Removing and installing battery - section on "Removing" 270619 Removing and Installing Battery
2. Remove trim panel with sound absorber for luggage compartment. -> 70061903 Removing and installing luggage compartment trim panel (luggage compartment cover) at the lock support - section on "Removing"
-> 70061901 Removing and installing luggage compartment trim panel (luggage compartment cover) at the sides - section on "Removing"
-> 70061900 Removing and installing centre luggage compartment trim panel (luggage compartment cover) - section on "Removing"
3. Open power distributor (HSB) and disconnect cable for fuse element and B+ line. -> 978919 Removing and installing power distributor (HSB) - section on "Removing" 978919 Removing and installing power distributor (HSB)
4. Loosen fuse box in luggage compartment. -> 978409 Loosening and securing fuse box - section on "Loosening" 978409 Loosening and securing fuse box
5. Remove the tail light. -> 943119 Removing and installing tail light - section on "Removing" Service and Repair
6. Remove trailer hitch control unit. -> 669619 Removing and installing trailer hitch control unit - section on "Removing" 669619 Removing and installing trailer hitch control unit
7. Release and disconnect electric plug connection from the control unit for rear-end electronics. -> 578919 Removing and installing control unit for rear-end electronics - section on "Removing" 578919 Removing and Installing Control Unit for Rear-end Electronics
8. Remove rear apron. -> 635519 Removing and installing rear apron - section on "Removing"

Loosening main wire harness in luggage compartment

NOTICE

Incorrect handling of main wire harness

- Risk of damage to lines

-> The main wire harness contains all airbag lines, antenna lines and optical waveguides.
-> The main wire harness must not be separated and is always replaced as a complete wire harness when carrying out extensive repairs.
-> If individual lines are damaged, shut off these lines and install new lines. Lay the new lines along the main wire harness and secure them to the main wire harness.





Installation position of main wire harness in luggage compartment

1. Remove supports for luggage compartment cover.





Removing supports for luggage compartment cover

1.1. Unscrew fastening screws -1- for support for luggage compartment cover at the left and right.
1.2. Remove support for luggage compartment cover at the left and right -arrow-.
2. Loosen rubber sleeve -1- and pull out cable for tail light -2- at the left and right -arrow-.





Removing cable for tail light

3. Unclip cable for tail light at the left and right.
4. Release cable duct at the left and right.





Releasing cable duct and ground points

4.1. Unclip cable duct -1- at the left and right -arrow-.
4.2. Disconnect ground points -2- at the left and right.
5. Disconnect cable for trailer hitch.





Disconnecting cable for trailer hitch

5.1. Release and pull off electric plug connection for trailer hitch.
5.2. Unclip cable for trailer hitch -1- ( -arrow A- ).
5.3. Guide cable for trailer hitch -1- through the rubber sleeve -2- ( -arrow B- ).
6. Remove control unit for parking brake. -> 466219 Removing and installing control unit for electric parking brake - section on "Removing" 466219 Removing and installing control unit for electric parking brake
7. Disconnect electric plug connection from control unit for parking brake.
8. Remove TPM control unit and holder. -> 443419 Removing and installing TPM control unit - section on "Removing" 443419 Removing and installing tyre pressure monitoring system control unit
9. Disconnect electric plug connection from TPM control unit.
10. Disconnect electric plug connection for filler flap opener. -> 553819 Removing and installing switching element for filler flap - section on "Removing" Service and Repair
11. Remove side trim panel support.





Removing side trim panel support

11.1. Unscrew fastening screws -1- for side trim panel support.
11.2. Remove side trim panel support.
12. Disconnect electric plug connection for rear shock absorber (spring damper). -> 429319 Removing and installing rear shock absorber (spring damper) - section on "Removing" 429319 Removing and installing rear shock absorber (spring damper)
13. Remove PASM control unit and holder. -> 431619 Removing and installing PASM control unit - section on "Removing" 431619 Removing and installing PASM control unit
14. Disconnect electric plug connection from PASM control unit.
15. Disconnect electric plug connection for ABS. -> 976519 Removing and installing wire harness for ABS - section on "Removing" 976519 Removing and installing wire harness for ABS (vehicle with PDCC)
16. Unclip supply lines for ABS wire harnesses at the underbody, which go to the main wire harness in the luggage compartment.
17. Make sure that all electric plug connections going to the main wire harness in the luggage compartment are disconnected.
18. Release rubber sleeve and pull lines up out of the underbody in the luggage compartment area.
19. Release and disconnect electric plug connection for rear three-point belt at the left and right.
-> 691219 Removing and installing rear three-point belt - section on "Removing" 691219 Removing and installing rear three-point belt
20. Release and disconnect electric plug connection for head airbag unit at the left and right.
-> 696619 Removing and installing head airbag unit - section on "Removing" 696619 Removing and Installing Head Airbag Unit
21. Release and disconnect electric plug connection for heating element for rear backrest at the left and right. -> 745319 Removing and installing cover for rear backrest - section on "Removing" 745319 Removing and installing cover for rear backrest
22. Release and disconnect electric plug connection for wire harness for tailgate at the left and right. -> 972719 Removing and installing wire harness for tailgate - section on "Removing" 972719 Removing and installing wiring harness for rear panel flap
23. Remove sound absorber on rear wheel housing at the left and right.
24. Release and disconnect electric plug connection for acceleration sensor at the wheel housing -arrow-.





Disconnecting connector for acceleration sensor

25. Loosen fastening nut for ground point at the wheel housing in direction of travel going left -arrow- and remove cable.





Ground point at left wheel housing

26. Loosen fastening nut for ground point at the wheel housing in direction of travel going right -arrow- and remove cable.





Ground point at right wheel housing

Securing main wire harness in luggage compartment

1. Installation is performed in reverse order.
2. First lay the main wire harness loosely in the luggage compartment, ensuring that it is positioned correctly.
3. Clip in cable ducts.
4. Clip in main wire harness in luggage compartment as well as lines coming from it.
5. Plug in control units and electric plug connections until they engage securely.
6. Connect ground points.
7. Secure sound absorbers and trim panels.

Subsequent work

1. Plug in electric plug connection for locking mechanism for backrests at the left and right until it engages securely.-> 726319 Removing and installing locking mechanism for rear backrest - section on "Installing" 726319 Removing and installing locking mechanism for rear backrest
2. Plug in electric plug connection for head airbag unit at the left and right until it engages securely.-> 696619 Removing and installing head airbag unit - section on "Installing" 696619 Removing and Installing Head Airbag Unit
3. Plug in electric plug connection for rear three-point belt at the left and right until it engages securely.-> 691219 Removing and installing rear three-point belt - section on "Installing" 691219 Removing and installing rear three-point belt
4. Install PASM control unit and holder.-> 431619 Removing and installing PASM control unit - section on "Installing" 431619 Removing and installing PASM control unit
5. Plug in electric plug connection for PASM until it engages securely.
6. Install TPM control unit and holder.-> 443419 Removing and installing TPM control unit - section on "Installing" 443419 Removing and installing tyre pressure monitoring system control unit
7. Install control unit for parking brake. -> 466219 Removing and installing control unit for electric parking brake - section on "Installing" 466219 Removing and installing control unit for electric parking brake
8. Install rear apron. -> 635519 Removing and installing rear apron - section on "Installing"
9. Plug in electric plug connection for control unit for rear-end electronics until it engages securely.-> 578919 Removing and installing control unit for rear-end electronics - section on "Installing" 578919 Removing and Installing Control Unit for Rear-end Electronics
10. Install control unit for trailer hitch.-> 669619 Removing and installing control unit for trailer hitch - section on "Installing" 669619 Removing and installing trailer hitch control unit
11. Plug in electric plug connection for trailer hitch until it engages securely.
12. Install tail light.-> 943119 Removing and installing tail light - section on "Installing" Service and Repair
13. Fit fuse box in luggage compartment.-> 978409 Loosening and securing fuse box - section on "Securing" 978409 Loosening and securing fuse box
14. Install power distributor (HSB). -> 978919 Removing and installing power distributor (HSB) - section on "Installing" 978919 Removing and installing power distributor (HSB)
15. Make sure that all electric plug connections are plugged in and locked on the main wire harness in the luggage compartment.
16. Install trim panel and sound absorber for luggage compartment.
-> 70061903 Removing and installing luggage compartment trim panel (luggage compartment cover) at the lock support - section on "Installing"
-> 70061901 Removing and installing luggage compartment trim panel (luggage compartment cover) at the sides - section on "Installing"
-> 70061900 Removing and installing centre trim panel for luggage compartment (luggage compartment cover) - section on "Installing"
17. Install the battery.
-> 270619 Removing and installing battery - section on "Installing" 270619 Removing and Installing Battery
18. -> 2X00IN Work instructions after disconnecting the battery 2X00IN Work instructions after disconnecting the battery.