Removing and installing mobile telephone operating electronics control unit J412 — AUDI

🧭 Before you start

Fits: Audi A8 D3 (4E, 2002–2010)

🔩 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. When renewing control unit, select "“Replacement”" function for appropriate control unit in "“Guided Fault Finding”".
2. Switch off all electrical equipment.
3. Remove ignition key.
4. Remove front seat (left-side) General body repairs, interior72.
5. Fold back floor covering General body repairs, interior70.

6. Release electronics box cover and open box (arrows).
7. Pry mobile telephone operating electronics control unit J412(1) out of electronics box (2) in direction of arrow.
8. If fitted, unplug aerial for Bluetooth R152 at mobile telephone operating electronics control unit J412(1).
9. Unplug all connectors at mobile telephone operating electronics control unit J412(1).
10. Fit protective cap for cable connectorVAS 6223/9(1) onto MOST bus connector (2).
11. Installation is performed in reverse sequence.

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 rear lid seal - Coupé – Audi TT Mk2
• Removing and installing brake caliper, front brakes (17" FNR G57)
• Removing and installing starter - Audi TT with 3.2 ltr. MPI engine and dual clutch gearbox
• Removing and installing gearbox mounting - vehicles with 2.0 ltr. TFSI engine
• Renewing output flange oil seal on bevel box (bevel box removed)