Part 1

Removing And Installing Main Wiring Harness - Floor Area And Left-Hand Side

Removing Main Wiring Harness - Floor Area And Left-hand Side

Overview







INFORMATION:
- The repair instructions document "Main wire harness" is divided into several chapters because of its size.
- For body repairs, refer to the specific chapters on installing and removing individual sections of wiring.

CAUTION:
- The main wire harness contains all airbag lines, antenna lines and optical waveguides.
- The main wire harness must therefore not be cut for major repair work and must be replaced complete.
- If individual lines are damaged, isolate them (disconnect, remove plug contacts from plug connections etc.) and replace the original wire harness by installing new lines.

Removing Main Wiring Harness - Floor Area And Left-hand Side
Disconnect the battery
Remove side trim panel for rear luggage compartment.
Remove left rear light.
Remove rear seat
Remove left B-pillar trim panel
Remove front left side-section trim panel
Remove subwoofer
Remove auxiliary battery

Remove Floor Carpeting From The Work Area

CAUTION:
Danger of injury and material damage if airbag units are not handled correctly. Always observe the safety regulations for handling airbag units.
- Remove ignition key. Disconnect battery. Route or isolate the ground strap so that all contact with a ground carrier (e.g. body, seat frame) is avoided.
- After the battery is disconnected, always wait for 1 minute before disconnecting the airbag plugs.

1. Lift vehicle.

Only for vehicles with off-road stabiliser and/or tyre pressure monitoring system







2. Release plug connection for off-road stabiliser (rear wheel housing) -1- -Arrow A- and disconnect it -Arrow B-.
3. Release connector of antenna for tyre pressure monitoring system (rear wheel housing) -2- -Arrow C- and disconnect it -Arrow D-.







4. Release plug connection (roof rack rear) -Arrow A- and disconnect -Arrows B-.
5. Press out rubber sleeve and line upwards -Arrow C- and remove.

Only For Vehicles With Rear-differential Lock







6. Release both connectors on servo motor for rear-differential lock (rear differential) -Arrows A- and disconnect -Arrow B-.
7. Cut tie-wrap -C-.

Only in vehicles with Bi-XENON headlights







8. Release connector on angle sensor (rear wheel suspension) -Arrows A- and remove -Arrow B-.







9. Release both connectors (above angle sensor for headlight levelling system) -Arrows A- and remove them -Arrows B-.







10. Unplug centre (black) connector -arrow- (D-pillar lower right).







11. Unclip line on rear cross member -Arrows A-.
12. Release both connectors -Arrows B- and pull them off -Arrows C-.







13. Press down lock on plug socket (head airbag) -Arrow A- and maintain in this position.
14. Release the connector -Arrow B- and pull it off -Arrow C-.







15. Unclip the line -arrows- (D-pillar lower left).







16. Unscrew fastening nut (luggage compartment rear left) -1- and remove ground strap together with twist lock -a- herausnehmen -arrow-.







17. Unscrew fastening nut (roof rack rear) -1- and remove ground strap together with twist lock.
18. Pull off connector (pink) -arrow-.







19. Unclip line along pneumatic spring housing -Arrows A-.
20. Pull line behind head airbag down and out -Arrows B-.







21. Cut tie-wrap -A- and unclip line on C-pillar -Arrows B-.

Only For Vehicles With Rear-differential Lock







22. Release connector on control unit for rear-differential lock (left rear wheel housing) -Arrow A- and disconnect -Arrow B-.







23. Remove line together with guides from the threaded bolts -arrows- (rear wheel housing).







24. Press down the protective cover on the connector (seat belt at C-pillar) -Arrow A- and maintain in this position.
25. Release connector -Arrow B- and disconnect -Arrow C-.
26. Unscrew fastening nut and remove ground strap together with twist lock protection from ground pin.







27. Release connector (cutoff relay for auxiliary battery) -Arrow A- and disconnect -Arrow B-.







28. Undo fastening nuts -2- and remove cutoff relay -arrow-.







29. Turn the cutoff relay, then release the left cover -Arrows A- and open -Arrow B-.
30. Unscrew fastening nut -3- on cutoff relay and remove line from threaded bolt -Arrow C-.
31. Remove line with rubber sleeve from bracket -Arrow D-.







INFORMATION: The retaining pivots -a- are easily broken. So hold the housing firmly when removing the cover.

32. Release cover over fuse element for auxiliary battery (spare-wheel well) with a small screwdriver -Arrows A- and remove -Arrow B-.
33. Undo fastening nut -4- and remove the line -Arrow C-.







34. Remove line together with rubber sleeve -Arrow A- (spare-wheel well).
35. Remove cover from threaded bolts -Arrow B -.
36. Cut open tie-wraps -C- and remove the cover.







37. Remove line (along left wheel housing) from threaded bolts -arrows-.







38. Cut the two tie-wraps -A- (under rear seat).
39. Release connectors -Arrow B- and remove them from fixing clip -Arrow C-.
40. Open clip -Arrow D- and remove line from threaded bolt -Arrow E-.
41. Unscrew fastening screws -5- and remove rear seat support -Arrow F-.







42. Open tie-wrap (lower C-pillar) -Arrow A-.
43. Remove line from threaded bolt -Arrow B-.
44. Unscrew fastening nut -1- and remove ground straps together with twist lock -a- from threaded bolt.







45. Press out rubber sleeve (under rear seat) -arrow- and remove line upwards.
46. Remove airbag sensor on rear wheel housing.







47. Remove wiring duct (lower C-pillar) from threaded bolt and wheel housing seam -arrows-.

Only For Vehicles With Electric Adjustment Fitting







48. Press down protective cover (B-pillar) on connector -Arrow A- and maintain in this position.
49. Release connector -Arrow B- and pull off -Arrow C-.
50. Unscrew fastening nut -1- and remove ground straps together with twist lock -a- -Arrow D-.







51. Cut tie-wrap -a- (B-pillar).
52. Unclip cover at the top -Arrow A- and remove -Arrow B-.

A- & B-pillar







53. Release wire sleeve with a small screwdriver -Arrows A- and press away to the rear -Arrow B-.
54. Release connector for door wire harness -Arrows C- and pull off -Arrow D- connector.

A- & B-pillar







55. Release socket bracket -Arrows A- and remove -Arrow B-.
56. Release sockets -Arrows C- and pull out to the rear -Arrows D-.







57. Unclip line -arrows- (lower B-pillar).
58. Remove connector from airbag sensor at B-pillar.







59. Remove wiring duct (rear door floor area) from threaded bolts -arrows-.







60. Undo fastening nut -2- (central electrical system power distributor) and remove the line -Arrow A-.

Only for vehicles with auxiliary battery

61. Open cover -Arrow B-.
62. Undo fastening nuts -3- and remove line -Arrow C-.
63. Loosen wire harness in central electrical system power distributor.







64. Remove wiring duct (rear door floor area) from threaded bolts -Arrows A-.
65. Cut the tie-wraps -B-.

Remove main wire harness - dashboard area and centre console.