Removing and installing Climatronic control unit J255 — AUDI

🧭 Before you start

Fits: platform code FV

Don't miss

• If the J255(B) is to be replaced, select the "“Replace control unit”" function in the Guided Fault Finding routine before removing the unit ("“Guided Fault Finding”").

🔩 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 J255(B) is to be replaced, select the "“Replace control unit”" function in the Guided Fault Finding routine before removing the unit ("“Guided Fault Finding”").
2. Switch off ignition.
3. Equipment version with ignition lock: Remove ignition key.
4. Remove glove box General body repairs, interior68Shelves / trim panels; Removing and installing glove box.
5. Remove footwell vent (front passenger side) .

6. Unlock and unplug electrical connectors (1, 2, 3).
7. Unplug electrical connectors (4) by sliding locking element (5) upwards (arrow) and pressing catch (6) inwards.
8. Unscrew bolts (A) (tightening torque: 4 Nm). [Note: Different versions of Climatronic control unit J255 are available (e.g. for vehicles with a manually or automatically controlled air conditioner, etc.). It is important to observe the correct version and assignment Electronic parts catalogue.] — 4 Nm (3.0 lb-ft)
9. Interrogate event memory (of J255) and erase any entries displayed; then perform "“basic setting”" ("“Guided Fault Finding”").
10. As a final step, check operation of heater/air conditioner.

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