Removing and installing relay and fuse holder in electronics box (plenum chamber) — AUDI

🧭 Before you start

Fits: Audi A8 D3 (4E, 2002–2010)

Don't miss

• Cover air duct at air conditioner housing with clean cloth to stop anything falling in.
• Disregard (item 1).
• Exact assignment of contacts in relay and fuse holder in electronics box (plenum chamber) can be found in appropriate current flow diagram .

📋 Procedure

1. With ignition switched off, disconnect earth cable at battery .
2. Pull off rubber seal (1) for plenum chamber covers.
3. Detach plenum chamber covers (2) and (3).
4. Remove dust and pollen filter 87. [Note: Cover air duct at air conditioner housing with clean cloth to stop anything falling in.]
5. Remove wiper arms .

6. Unscrew bolts (arrows) for cowl panel trim (1) (left and right).
7. ⚠ Risk of damage to cowl panel trim.Apply a small quantity of soap solution to transition between windscreen and cowl panel trim (1). Then, starting at edge of windscreen, pull cowl panel trim vertically up and out of retainer at windscreen. — Carefully pull cowl panel trim off retainer at windscreen.
8. Unscrew bolts (arrows).
9. Detach both retainers and engine control unit from electronics box (plenum chamber).
10. Move engine control unit to side with connectors attached.
11. Turn air quality sensor G238(item 1) 90° in anti-clockwise direction and take sensor out of mounting.
12. Release retaining clips (arrows).
13. Slightly open cover for electronics box (plenum chamber) and pull off to front.
14. Release fasteners (arrows) and lift off relay and fuse holder in electronics box. [Note: Disregard (item 1).]
15. Unclip plug-in sockets for electrical multi-pin connectors. [Note: Exact assignment of contacts in relay and fuse holder in electronics box (plenum chamber) can be found in appropriate current flow diagram .] [Note: Refit all cable ties at the same locations when reinstalling.]
16. Connect battery. Steps required .
17. Adjust wiper arms .

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