Removing and installing mobile telephone operating electronics control unit J412 - Coupe (as of MY 04) — AUDI
Removing and installing mobile telephone operating electronics control unit J412 - Coupe (as of MY 04) on Audi: 9 steps, 1 torque figure.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi TT Mk1 (8N)
🔩 Torque settings
Values can differ between engine variants — check the code stamped on your block.
| Torque | Fastener / step |
|---|---|
| 5 Nm (3.7 lb-ft) | Screw out bolts (2), (3) and (5 |
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
- Switch off all electrical consumers.
- Remove ignition key.
- Remove left luggage compartment side trim: General Body Assembly, Interior70.
- Screw out bolts (2), (3) and (5) (5 Nm). — 5 Nm (3.7 lb-ft)
- Swivel the bracket, with the CD changer (1) and control unit (4) to the side.
- Unplug the connector at the control unit and detach the Bluetooth aerial.
- Push the control unit out of the bracket.
- Installation is performed in reverse sequence.
- Encode and adapt radio: Radio, Telephone and Navigation System Self-diagnosis01.
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
- Testing a "two-line bus system" – Audi A2
- Removing and installing locking cable on vehicles with vehicle ID No. up to 8E_8A 002699
- Installing top part of sump - "“engine generation III”" · 1 torque figures
- Raising wheel bearing housing to reference position before tightening bolts
- Checking power steering fluid level (V8 diesel and V10 and W12 petrol engines only)
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.