Removing and installing auxiliary relay carrier in electronics box (plenum chamber, right-side) — AUDI

🧭 Before you start

Fits: Audi A6 C6 (4F, 2004–2011)

Don't miss

• The pump/valve unit for heater (left-side in front of electronics box) becomes very hot during use - risk of burns! — Remove cover for electronics box (plenum chamber, right-side).
• The engine control unit remains connected to the wiring harness.
• Disregard (item 4) and (item 5).
• The engine control units remains connected to the wiring harness.
• Exact contact assignment of auxiliary relay carrier in electronics box (plenum chamber, right-side) can be found in appropriate current flow diagram .

📋 Procedure

1. Remove wiper arms .
2. With ignition switched off, disconnect earth cable at battery .
3. Pull off rubber seal (1) for plenum chamber cover.
4. Remove plenum chamber cover (2).
5. Unscrew bolts (arrows) for cowl panel trim (1) (left and right).

6. ⚠ Risk of damage to cowl panel trim.Apply a small quantity of soap solution to transition between windscreen and cowl panel trim. — Starting at edge of windscreen, carefully pull cowl panel trim (1) vertically up and out of retainer at windscreen.
7. Unscrew bolts (arrows).
8. ⚠ The pump/valve unit for heater (left-side in front of electronics box) becomes very hot during use - risk of burns! — Remove cover for electronics box (plenum chamber, right-side).
9. Carefully pry off retaining strap (3) using a screwdriver (arrows 1 and 2) and remove engine control unit from electronics box (plenum chamber, right-side). [Note: The engine control unit remains connected to the wiring harness.]
10. Unscrew electrical wiring connection (1) at main fuse holder (2). [Note: Disregard (item 4) and (item 5).]
11. Release retaining clips (arrows) and remove engine control unit/units (1) and (2). [Note: The engine control units remains connected to the wiring harness.]
12. Unscrew bolts (arrows).
13. ⚠ The pump/valve unit for heater (left-side in front of electronics box) becomes very hot during use - risk of burns! — Remove cover for electronics box (plenum chamber, right-side).
14. Release retaining clips (arrows) and lift relay carrier out of electronics box (plenum chamber, right-side).
15. Unclip bracket for auxiliary fuses at relay and fuse holder.
16. Withdraw relays or control units and then unclip appropriate relay carrier. [Note: Exact contact assignment of auxiliary relay carrier in electronics box (plenum chamber, right-side) can be found in appropriate current flow diagram .]
17. Connect battery. Steps required .
18. Adjust wiper arms .

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