Installing replacement wiring harness: Audi Q7

🧭 Before you start

Fits: Audi Q7 (4L, 2005–2015)

🔩 Torque settings

Values can differ between engine variants — check the code stamped on your block.

ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.

📋 Procedure

1. Start with rear lid.
2. Fit hose connection (1) to connection on rear window wiper.
3. Clip in cable retainers (arrows) accordingly.
4. Guide wiring harness through opening (1) to spoiler.
5. Fit seal (2) and plug in aerial connectors (1).

6. Plug in aerial connectors (2) and (3) at aerial amplifier 3R112(4) and clip in cable retainer (1).
7. Continue to fit wiring harness (1) on roof frame (arrows).
8. Route wiring harness (1) along existing wiring harness starting at area (2) (fabric sheath).
9. Use cable ties as required.
10. Continue to route wiring harness to D-pillar and C-pillar (arrows).
11. At D-pillar, the wiring harness is split into two sections (1) and (4).
12. Remove bolts (2) and (3) (4 Nm) on curtain airbag and guide wiring harness section (4) along the existing wiring harness between curtain airbag and D-pillar. — 4 Nm (3.0 lb-ft)
13. Use cable ties as required.
14. Fit the two bolts (2) and (3) (4 Nm) again. — 4 Nm (3.0 lb-ft)
15. Route wiring harness (1) along existing wiring harness at side window (right-side) (arrows).
16. Use cable ties.
17. Tighten earth cable 2 (9 Nm). — 9 Nm (6.6 lb-ft)
18. Route aerial wire to TV tuner R78.
19. Unplug brown connector (2) on TV tuner R78(1) and connect new brown connector (3).
20. Cut off detached brown connector (2) from aerial wire and tie up wire to existing harness.
21. Route wiring harness (1) along top of side window (right-side) up to C-pillar (arrows).
22. Use cable ties.
23. Tighten earth cable (2) (9 Nm). — 9 Nm (6.6 lb-ft)
24. Unplug aerial connectors (1) (brown) and (2) (blue) at aerial amplifier R24 and cut off at the existing wiring harness (arrow).
25. Fit brown and blue aerial connectors of new wiring harness on aerial amplifier R24.
26. Then route washer fluid pipe.
27. Remove the digital sound package control unit J525.
28. Route washer fluid pipe (2) on existing wiring harness (1) behind digital sound package control unit J525(arrow) up to wheel housing.
29. Pull the existing washer fluid hose (1) slightly out of the wiring harness and route the new washer fluid hose (2) along the existing washer fluid hose.
30. Cut through both hoses at the location marked.
31. ⚠ The hose may still contain washing fluid. Use a drip tray. — Join the severed ends of the washer fluid hoses (1) and (4) using connection piece 1J0.955.875.R (2) and connecting piece 1J0.955.875 (3).
32. Push shrink hose (5) onto one of the hoses and fit the connection pieces together.
33. Slide shrink hose over connection and use hot air blower, 220 V/ 50 HzVAS 1978/14 from wiring harness repair setVAS 1978A to produce a leak-proof seal.
34. Insert washer fluid hose in wiring harness.
35. Check operation.

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