Removing and installing navigation system with CD drive control unit J401, MMI basic (up to week 35/08) — AUDI
Removing and installing navigation system with CD drive control unit J401, MMI basic (up to week 35/08) on Audi: 11 steps.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi A6 C6 (4F, 2004–2011)
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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.
📋 Procedure
- Switch off all electrical equipment.
- Remove ignition key.
- When renewing control unit, select "“Replacement”" function for appropriate control unit in "“Guided Fault Finding”".
- ⚠ The MOST Bus fibre optic cables for the navigation system with CD drive control unit J401 have been made as short as possible.Unplug the Most Bus connector at the navigation system with CD drive control unit J401 before removing the navigation system with CD drive control unit J401. — Release retainers (C) and detach service flap (A).
- Unplug all connectors at navigation system with CD drive control unit J401.
- Fit protective cap for cable connectorVAS 6223/9(1) onto MOST bus connector (2).
- 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.
- Press release tabs on navigation system with CD drive control unit J401 and remove radio release tool T10057.
- Plug in connectors.
- Insert the navigation system with CD drive control unit J401 into mounting frame until it engages.
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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.