Removing and installing navigation system with CD drive control unit J401 — AUDI
Removing and installing navigation system with CD drive control unit J401 on Audi: 14 steps, 6 torque figures.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi A8 D3 (4E, 2002–2010)
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- Insert two radio release tools T10057 into slots on navigation system with CD drive control unit J401 until they engage. Pointed ends of grips must face outwards.
🔩 Torque settings
Values can differ between engine variants — check the code stamped on your block.
| Torque | Fastener / step |
|---|---|
| 2 Nm (1.5 lb-ft) | Loosen securing bolts (2 |
| 3 Nm (2.2 lb-ft) | Unscrew bolts (arrows |
| 3.5 Nm (2.6 lb-ft) | Loosen securing bolts (arrows |
| 3.5 Nm (2.6 lb-ft) | Slacken off bolt (3 |
| 3.5 Nm (2.6 lb-ft) | Slacken off bolts (1 |
| 8 Nm (5.9 lb-ft) | Unscrew nut (1 |
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
- When renewing control unit, select "“Replacement”" function for appropriate control unit in "“Guided Fault Finding”".
- Switch off all electrical equipment.
- Remove ignition key.
- Open left-side luggage compartment storage area.
- Insert two radio release tools T10057 into slots on navigation system with CD drive control unit J401 until they engage. Pointed ends of grips must face outwards.
- Pull navigation system with CD drive control unit J401 out of mounting frame.
- Unplug all connectors at navigation system with CD drive control unit J401.
- Fit protective cap for cable connector VAS 6223/9(1) onto MOST bus connector (2).
- Press release tabs on navigation system with CD drive control unit J401 and remove radio release tool T10057.
- Unscrew nut (1) (8 Nm) and bolt (2) (8 Nm). — 8 Nm (5.9 lb-ft)
- Unscrew bolts (arrows) (3 Nm) in order to detach frame from slide-in module. — 3 Nm (2.2 lb-ft)
- Installation is performed in reverse sequence.
- Plug in all connectors.
- Insert the navigation system with CD drive control unit J401 into mounting frame until it engages.
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 side airbags on driver and front passenger sides
- Removing and installing Denso air conditioner compressor, vehicles with 4-cylinder engine and Denso air conditioner compressor · 1 torque figures
- Removing and installing speed sensor wire on front axle
- Removing and installing brake pads, Crafter 5.0 t
- Removing and installing shackle, vehicles with twin wheels
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 → · How these pages are made →Workshop data on this page last updated 20 Sep 2026.