Removing and installing navigation system with CD drive control unit J401 (MMI) — AUDI
Removing and installing navigation system with CD drive control unit J401 (MMI) on Audi: 10 steps. What to remove, in what order, and what to check after.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi Q7 (4L, 2005–2015)
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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
- When renewing control unit, select "„Replacement“" function for appropriate control unit in "„Guided Fault Finding“".
- Switch off ignition and all electrical equipment and remove ignition key.
- Remove luggage compartment floor and recess in luggage compartment.
- 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 connectorVAS 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.
- Plug in 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
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- Removing and installing main fuse carrier - Audi RS6 – Audi
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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.