Removing and installing operating unit (Climatronic control unit J255) - automatically controlled air conditioner — AUDI

🧭 Before you start

Fits: Audi A1 (8X, 2010–2018)

🔩 Torque settings

Values can differ between engine variants — check the code stamped on your block.

ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.

📋 Procedure

1. If the operating unit (Climatronic control unit J255) is renewed, select "“Control unit replacement”" in "“Guided Fault Finding”" or "“Guided Functions”" mode.
2. Observe general notes .
3. Remove mounting for switch unit (bottom) Electrical system96Controls; Removing and installing switches in dash panel.
4. Remove bolt (1).
5. Using removal wedge3409, release operating unit (2) at top (arrow) and pull it out of guides.

6. Unplug electrical connector (4) by sliding locking element (2) upwards and pressing catch (1) inwards.
7. Unplug electrical connector (3). [Note: If the measured value for the dash panel temperature sensor G56 is incorrect, check the intake grille of the operating unit (Climatronic control unit J255) (must not be closed off) and check the operation of the temperature sensor blower V42.] [Note: From model year 2012 onwards, Z35 is also installed on vehicles with certain petrol engines (gradual introduction). The correct version of the operating unit (Climatronic control unit J255, part number 8X0 820 043 from index "“B”" onwards) and the correct version of the engine control unit must be installed so that the operating unit J255 and the corresponding engine control unit can activate Z35 and Electronic parts catalogue.]
8. It is important to observe the correct version and assignment Electronic parts catalogue.
9. When renewing the operating unit (Climatronic control unit J255), take care to select the correct version Electronic parts catalogue.
10. Tighten bolt (1) to 1.5 Nm. — 1.5 Nm (1.1 lb-ft)
11. Perform/check coding.
12. Perform basic setting.
13. Interrogate event memory (and eliminate cause of any entries displayed).
14. Check adaption.
15. Perform final control diagnosis if applicable.

Other AUDI procedures

• Removing and installing toothed belt – Audi · 56 torque figures
• Removing engine – Audi A8 D3 · 41 torque figures
• Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
• Installing engine – Audi A8 D4 · 36 torque figures
• Removing and installing camshaft timing chain · 29 torque figures
• Removing and installing relay and fuse carrier in luggage compartment electronics box (left) · 1 torque figures
• Checking engine glow plugs Q6 · 1 torque figures
• Checking engine oil cooler for leaks
• Checking metering adjuster N146 – Audi 2.5 TDI
• Removing dash panel insert trim