Removing and installing operating and display unit: Audi TT Mk2

🧭 Before you start

Fits: Audi TT Mk2 (8J, 2006–2014)

• Special tools named: VAS 5051

📋 Procedure

1. If air conditioner/heater operating unit (Climatronic control unit J255) is being renewed, read out adaption and coding of air conditioner (heater) operating unit (Climatronic control unit J255) via "“Replace control unit”" function in Guided Fault Finding mode Guided Fault Finding function of vehicle diagnostic, testing and information system VAS 5051.
2. Switch off ignition.
3. Apply the hook3438(B) for example to the air conditioner (heater) operating unit, Climatronic control unit J255(A) as shown (left and right).
4. Carefully pull the air conditioner (heater) operating unit, Climatronic control unit J255 in (arrow direction) out of the centre console. [Note: Air conditioner (heater) operating units, Climatronic control unit J255 with an additional reinforcing strip (A) on the back are to be gradually introduced in Model Year 2007. Apply the hooks3438(B) on the left and right in each case at this strip (A).] [Note: At the start of production, the clips (A) used to fit the air conditioner (heater) operating unit, Climatronic control unit J255 hold the air conditioner (heater) operating unit so firmly in position in the centre console that removal is only possible after releasing the fastener (a modified fastener was gradually introduced).]
5. ⚠ Take care not to pull too firmly to avoid damaging the air conditioner (heater) operating unit, Climatronic control unit J255 and the centre console on removal.The air conditioner (heater) operating unit, Climatronic control unit J255 is held in position with the clips and support brackets of the centre console. If the clips are too tight, use a screwdriver to unfasten them from the rear .Take care not to damage the surface of the centre console on removal (cover up if necessary). — Remove radio or radio/navigation system Communication91Radio; Removing and installing radio or Communication91Navigation system; Removing and installing navigation system control unit.

6. Remove trim panel (D)General body repairs, interior70Dash panel; Removing and installing trim panel for dash panel.
7. Reach into the dash panel opening with a small screwdriver (B) and release the fastener of the clips (A) (on the left and right of the air conditioner/heater operating unit) from the support brackets of the centre console (C).
8. Slide the air conditioner (heater) operating unit, Climatronic control unit J255(E) out of the centre console.
9. Release the fasteners at the connector (E) and unplug the connector.
10. Carefully turn the air conditioner (heater) operating unit, Climatronic control unit J255(F) through 180°.
11. Release the connectors (D) and (A) to (C) by pressing the retainer tabs (G) and unplug the connectors.
12. Re-encode (check the encoding of) the air conditioner (heater) operating unit, Climatronic control unit J255.
13. Perform basic setting of the air conditioner (heater) operating unit, Climatronic control unit J255.
14. Interrogate event memory of air conditioner (heater) operating unit, Climatronic control unit J255 (and rectify the cause of any faults displayed).
15. If applicable, check the adaption of the air conditioner (heater) operating unit, Climatronic control unit J255.
16. If applicable, perform final control diagnosis for the air conditioner (heater) operating unit, Climatronic control unit J255.

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