Removing and installing rear fresh air blower control unit J391 — AUDI

🧭 Before you start

Fits: Audi A8 D4 (4H, 2010–2017)

📋 Procedure

1. Remove driver and front passenger seat General body repairs, interior72Front seats; Removing and installing front seat.
2. Switch off ignition.
3. Remove the base plate of the centre console (A) and the insulating mat (B)General body repairs, interior68Centre console; Removing and installing centre console bracket.
4. ⚠ The heat sink at the rear fresh air blower control unit J391 may be hot. — On vehicles with a rear air conditioning unit, pull the heat exchanger (A) slightly out of the air conditioning unit on account of the coolant lines (C) (to create space for removing J391) Removing heat exchanger of rear air conditioning unit from air conditioning unit and re-installing.
5. Unplug the connectors (B) and (C) from J391.

6. Remove bolts (A).
7. Detach J391(D).
8. Different versions of J391 are available as replacement parts. Pay attention to correct assignment Electronic parts catalogue.
9. Re-install all parts removed in reverse order.
10. Perform basic setting and final control diagnosis for the air conditioner in "“Guided Fault Finding”" mode.
11. Interrogate the event memory of E265 and J255 and erase any faults displayed in "“Guided Fault Finding”" mode.

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