Removing Main Wire Harness
Removing And Installing Main Wire Harness Continued
Removing main wire harness
CAUTION: Damage caused by improper handling of main wire harness.
- 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 wires are damaged, these must be "shut down" (disconnect wires, remove plug-in contacts from plug connections, etc.) and replaced by installing new wires. Lay the new wires along the main wire harness and tie them to it.
INFORMATION: Depending on the equipment I No., the installation positions of the audio components in the front luggage compartment differ.
1 - Plug connection between main wire harness and front-end wire harness right
2 - Fuse box for fan
3 - Connector for front-end control unit
4 - 6 - Connector for navigation unit
7 - 8 - Connector for CD changer
9 - Connector for loudspeaker amplifier
10 - Connector for luggage compartment light
11 - Ground point
12 - Plug connection between main wire harness and front-end wire harness left
13 - Connector for hydraulic unit 14 - Connector for brake fluid sender
15 - Connector for tyre pressure monitoring system control unit
16 - Grommet
17 - 18 - Plug connection for ABS wire harness, front left and right
19 - 20 - Connector for tyre pressure monitoring system antenna, left and right
21 - Connector for filler flap switching element
22 - Connector for tank filler neck
23 - Connector for rod antenna
24 - Connector for GPS antenna
25 - Connector for radio antenna
26 - Connector for vertical sensor
27 - Connector for pressure switch
28 - Connector for alarm siren
29 - B+ line to power distributor
30 - 31 - Plug connection for PASM, front left and right
32 - 33 - Connector for windscreen washer system spray nozzle, left and right
34 - Connector for headlight beam adjustment angle sensor
35 - Connector for fluid level indicator sender
36 - Connector for windscreen washer system pump
37 - Connector for headlight washer pump
38 - Connector for wiper motor
39 - Connector for alarm horn
40 - Connector for fuel level sensor
41 - Grommet
1. Disconnect plug connection between main wire harness and frontend wire harness, right -1-.
1.1. Release plug connection between front-end wire harness and main wire harness, right -Arrow a- and disconnect -Arrow B-.
1.2. Turn socket 90 degrees clockwise and remove.
2. Pull off connector on fuse box for fan -2-.
2.1. Unclip fuse box for fan -Arrow A- and lift up and off -Arrow B-.
2.2. Release lid -arrows- and open -Arrow C-.
2.3. Pull off connector on fuse box for fan -Arrow D-.
3. Loosen ground point left -11-.
3.1. Screw off fastening nut and remove ground straps.
4. Release plug connection between main wire harness and front-end wire harness, left -12- and disconnect. Unclip connector socket.
5. Release connector on hydraulic unit -13- and pull it off.
6. Release connector on brake fluid sender -14- and pull it off.
7. Release connector for tyre pressure monitoring system control unit -15- and pull it off.
8. Unclip wire harness for front end control unit -arrow-.
9. Unclip wire harness to loudspeaker amplifier -Arrows A- and remove adhesive tape -Arrow B-.
10. Unclip wire harness to CD changer/navigation unit -arrows-.
11. Remove grommets -16- left and right.
12. Pull through main wire harness in direction of plenum panel.
13. Disconnect and release ABS wire harness front left and right -17 and 18-.
13.1. Release and disconnect plug connection for wheel sensor at left and right.
13.2. Unscrew fastening screw of connector socket.
13.3. Release rear wire harness.
14. Release and pull off connectors on front antenna for tyre pressure monitoring system -19 and 20- at left and right.
15. Release and pull off connector of switching element for filler flap -21-.
16. Pull off connector from tank filler neck -22-.
INFORMATION: Only in the cabriolet.
17. Release connector on rod antenna -23- and pull it off.
18. Unclip wire harness on end plate under windscreen at the three retaining clips -arrow-.
19. Release connector on GPS antenna -24- and pull it off.
20. Release connector on radio antenna -25- and pull it off.
21. Release connector for vertical sensor -26- and pull it off.
INFORMATION: Only for vehicles with I number 536
22. Release connector for pressure switch -27- and pull it off.
23. Release connector for alarm siren -28- and pull it off.
24. Release and pull off B+ line -29- from power distributor.
25. Release plug connections for PASM, front left and right -30 and 31- -Arrow a- and disconnect.
26. Release and pull off connectors for windscreen washer system spray nozzle, left and right -32 and 33-.
INFORMATION: Only for vehicles with TPM.
27. Release and pull off connector on front angle sensor for headlight beam adjustment -34-.
28. Release and pull off connector on wiper motor -38-.
29. Release and pull off connector on alarm horn -39-.
30. Undo the four fastening nuts on the battery retaining bracket and remove the battery retaining bracket.
31. Release connector on fuel level sender -40- -Arrow A- and pull it off -Arrow B-.
32. Unclip wire harness on end plate under windscreen at the two retaining clips -arrow-.
33. Remove grommets -41- in centre, and on left and right.
34. Pull through main wire harness in direction of interior.
Exposing main wire harness in passenger compartment
1. Loosen seat belt mount at left and right.
1.1. Press off cap -1- with a screwdriver and unscrew the fastening screw -2-. Remove seat belt with fitting -3- and spacer sleeve -4-.
2. Disengage floor covering at the support and lay it in the vehicle interior.
3. Remove left and right support.
3.1. Unlock locating peg -1- of the support using the commercially available removal tool Disassembly tool, universal NR.21.
3.2. Unscrew fastening screws -2- and nuts -3- and carefully pull the support up and out of the retaining points.
Removing main wire harness in passenger compartment
1 - 3 - Connector for steering column switch
4 - Connector for main light switch
5 - Connector for ignition lock
6 - Connector for diagnostic box
7 - Connector for footwell light, left
8 - Connector for instrument cluster
9 - 10 - Connector for passenger's airbag, stage 1 and stage 2
11 - Connector for footwell light, right
12 - Plug connection for glove box
13 - Connector for stopwatch
14 - Connector for sun sensor
15 - Connector for centre speaker
16 - 17 - Connector for loudspeaker, left and right
18 - Connector for switch console
19 - 20 - Connector for climate control
21 - 26 - Connector for PCM
27 - Connector for central locking
28 - Connector for hazard warning light switch
29 - 30 - Plug connection for illumination of centre nozzle
31 - 32 - Plug connection for illumination of left and right nozzle
33 - 34 - Plug connection between main wire harness and wire harness for rear of vehicle
35 - 36 - Plug connection between main wire harness and wire harness for engine
37 - Connector for rear vertical sensor
38 - 39 - Connector for DME control unit
40 - Ground point for rear luggage compartment
41 - Connector for rear luggage compartment light
42 - Connector for angle sensor for range adjustment, rear
43 - Rubber sleeve
44 - Connector for additional brake light
45 - 46 - Plug connection for PASM, left and right
47 - Connector for motor for hood compartment lid drive mechanism
48 - 49 - Connector for tyre pressure monitoring system antenna, left and right
50 - 51 - Plug connection for ABS wire harness, rear left and right
52 - Rubber sleeve
53 - Rear window heating plug connection
54 - Connector for hood mechanism
55 - Subwoofer connector
56 - 57 - Connector for front seat-belt pretensioner, left and right
58 - 59 - Connector for airbag sensor, centre left and right
60 - 61 - Connector for ParkAssist control unit
62 - 64 - Connector for control unit for rear convenience systems
65 - Ground point under driver's seat
66 - 69 - Connector for telephone control unit
70 - Ground point under passenger's seat
71 - 72 - Connector for front seat, left and right
73 - Connector for driver's seat with memory
74 - Connector for door sill button module
75 - 76 - Plug connection between main wire harness and wire harness for door, left and right
77 - Fuse box 78 - Relay carrier
79 - 80 - Connector for vehicle electrical system control unit
81 - Connector for gateway control unit
82 - 83 - Connector for KESSY/PAS control unit
84 - Connector for brake light switch
85 - Connector for pedal sensor
86 - Plug connection between main wire harness and wire harness for centre console
87 - Plug connection for telephone handset
88 - Airbag control unit connector
89 - Connector for parking-brake lever contact switch
90 - Tiptronic position switch
91 - Ground point under unit carrier
92 - Connector for tilt sensor control unit
93 - Power distributor
94 - 95 - Plug connection between main wire harness and wire harness for heater/air-conditioning unit
96 - 97 - Connector for garage door opener control unit
98 - Connector for interior light
99 - Latching hook microswitch connector
100 - Plug connection for rain sensor
101 - 102 - Plug connection for make-up mirror, left and right
103 - 107 - Connector for antenna unit, left and right
1. Disconnect plug connections for main wire harness to rear wire harness -33 and 34-.
1.1. Release plug connections for main wire harness to rear wire harness -35 and 36- and -arrows A- disconnect.
2. Disconnect plug connections for main wire harness to engine wire harness.
2.1. Release plug connections for main wire harness to engine wire harness -arrows A- and disconnect -arrows B-.
2.2. Release sockets for main wire harness -arrows C- and push down from relay carrier -arrows D-.
3. Release connector for rear vertical sensor -37- and pull it off.
4. Release and pull off connector on DME control unit -38 and 39-.
5. Loosen ground point in luggage compartment -40-.
5.1. Screw off fastening nut and remove ground strap.
6. Release and pull off connector on rear angle sensor for range adjustment -42-.
7. Remove rubber sleeves -43-.
8. Unclip main wire harness in rear luggage compartment.
9. Disconnect PASM plug connections -45 and 46- at the left and right.
9.1. Remove PASM plug connections on the left and right from both holders -arrow B-, release -arrow a- and disconnect them -arrows C-.
9.2. Open both holders -arrow D- and take off from actuating cable.
9.3. Remove wire harness to motor for hood compartment lid mechanism from the holder -arrow B-.
10. Release connector on motor for hood compartment lid mechanism -47- and pull it off.
11. Release and pull off connector on rear antenna for tyre pressure monitoring system -48 and 49- at the left and right.
12. Disconnect and expose ABS wire harness rear on left and right -50 and 51-.
12.1. Release and disconnect plug connection for wheel sensor at the left and right.
12.2. Unscrew fastening screw of connector socket.
12.3. Release rear wire harness.
13. Unclip the main wire harness in the area of the rear left spring strut.
14. Release rear window heating plug connection -53- and disconnect it.
15. Release connector on hood mechanism -54- and pull it off.
16. Pull off connector on front seat-belt pretensioner at the left and right -56 and 57-.
17. Unclip main wire harness to the left side wall. Unclipping main wire harness to the left side wall
17.1. Unclip main wire harness to the left side wall -arrow A-.
17.2. Unclip cable duct to the left side wall -arrow B-.
18. Loosen cable duct to the left side wall.
18.1. Unclip main wire harness to the bottom of the B-pillar -arrow A-.
18.2. Take out cable duct upwards out of the rear wall plate -arrow B-.
19. Release and pull off connector for airbag sensor, centre left and right -58 and 59-.
20. Release and pull off connector for ParkAssist control unit -60 and 61-.
21. Release and pull off connector for control unit for rear convenience systems -62 to 64-.
22. Loosen ground point under the driver's seat -65-.
22.1. Screw off fastening nut and remove ground straps.
23. Unclip ground point under driver's seat.
24. Release and remove connectors for telephone control unit -66 to 69-.
24.1. Unclip wire harness for telephone control unit.
25. Loosen ground point under the passenger's seat -70-.
25.1. Screw off fastening nut and remove ground straps.
26. Unclip wire harness at door sill.
27. Disconnect the plug connection between main wire harness and wire harness for door, left and right -75 and 76-.
28. Release and pull off connector for gateway control unit -81-.
29. Release and pull off connectors for KESSY/PAS control unit -82 and 83-.
30. Release and pull off connector for brake light switch -84-.
31. Release and pull off connector for pedal sensor -85-.
32. Loosen ground point under the unit carrier -91-.
32.1. Screw off fastening nut and remove ground straps.
33. Release and pull off connector for tilt sensor control unit -92-.
34. Disconnect plug connections between main wire harness and wire harness for heater/air-conditioning unit -94 and 95-.
34.1. Release lower plug connection on heater/air-conditioning unit -arrows a- and unplug.
34.2. Release upper plug connection on heater/air-conditioning unit -arrows a- and unplug.
34.3. Cut tie-wraps (main wire harness to heater/air-conditioning unit wire harness) with side cutters. Remove main wire harness.
35. Release and disconnect plug connection for rain sensor -100-.
36. Disconnect plug connection of make-up mirror, left and right -101 and 102-.
36.1. Unclip plug connection from console -arrow B-.
36.2. Release plug connection -arrow a- and disconnect it -arrows C-.
37. Unclip cable duct at front of roof frame.
38.Unclip main wire harness at front of roof frame.
39. Remove main wire harness from A-pillar -area A-.
40. Pull off connector for antenna amplifier, left and right -103 to 107-.
41. Loosen ground points on dashboard bracket. Loosening ground points on dashboard bracket
41.1. Unscrew fastening nuts and remove ground straps.
42. Unclip length compensation at the steering column. Unclipping length compensation
42.1. Remove expansion rivet and length compensation.
43. Unclip cable guide on dashboard bracket. Unclipping cable guide
44. Loosen holder for relay carrier.
44.1. Unscrew the two fastening screws and remove the relay carrier holder from the dashboard bracket.
45. Loosen main wire harness at left dashboard bracket.
45.1. Screw off fastening nut and remove fastening screw.
45.2. Unclip main wire harness on cable guide.
46. Loosen main wire harness at right dashboard bracket.
46.1. Unclip main wire harness on both cable guides.
47. Loosen main wire harness at centre dashboard bracket.
47.1. Undo the four tie-wraps and remove main wire harness.