Removing and installing control dial for left seat (and neck) heating Operating and display unit 1 for air conditioner E774 — AUDI

🧭 Before you start

Fits: platform code FV

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• Depending on the installation location, ensure that different versions of dash panel vent are positioned correctly Electronic parts catalogue.
• Check the foam seal (1) on the dash panel vent for damage and make sure the foam is secured properly

📋 Procedure

1. Switch off ignition.
2. Equipment version with ignition lock: Remove ignition key.
3. Removing left dash panel vent (A) and General body repairs, interior70Dash panel; Exploded view - dash panel
4. Unlock and unplug electrical connector (2).
5. Release pin (3) and pull out (arrow) .

6. Remove the Operating and display unit 1 for air conditioner E774(4) from the removed dash panel vent (arrow). [Note: The operating units for the left and right side exchange information with the Climatronic control unit J255 via a "“LIN bus”" data line. The signals that the dial control transmits to the left and right side are different, which is why a dial control must always be installed in the side for which it was specifically designed ("“Guided Fault Finding”").There are different versions of E774 (e.g. for the left and right seat or for vehicles with and without neck heating, etc.). It is important to observe the correct version and assignment Electronic parts catalogue.The various operating and display units and the dash panel vents are coded with tongue and groove connections, so make sure that these components are assigned correctly to one another Electronic parts catalogue.Different data signals sent by the operating unit along the LIN bus are used by the E774 to assign the signal for activation of the seat heating (and / or neck heating) for the left seat and by the E778 to assign the signal from control unit J255 for the right seat. Problems activating the seat heating (and / or neck heating) with identical or interchanged operating units ("“Guided Fault Finding”" for the J255) Electronic parts catalogue and]
7. Depending on the installation location, ensure that different versions of dash panel vent are positioned correctly Electronic parts catalogue.
8. Check the foam seal (1) on the dash panel vent for damage and make sure the foam is secured properly
9. Check the electrical connections in the dash panel vent (2) and on operating and display unit (4) for damage and contamination.
10. Insert the operating and display unit (1) in the dash panel vent on the correct side (arrow), taking into account the electrical connections (2, 4).
11. Insert operating and display unit (1) all the way into the dash panel vent and secure with pin (3).
12. Lock pin (3).
13. Join connector (2).
14. Installing dash panel vent and General body repairs, interior70Dash panel; Exploded view - dash panel
15. Interrogate event memory (of Climatronic control unit J255) and erase any displayed entries ("“Guided Fault Finding”").
16. Then check that seat heating (and neck heating) is functioning properly.

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