Removing and installing navigation system with CD drive control unit J401, MMI, up to week 44/2008 — AUDI
Removing and installing navigation system with CD drive control unit J401, MMI, up to week 44/2008 on Audi: 14 steps.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi A5 (8T, 2007–2016)
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- Insert two radio release tools T10057 into release slots on navigation system with CD drive control unit J401 until they engage. Pointed ends of tool 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”".
- Open left-side luggage compartment storage area.
- Unscrew nuts (1), (2), (4) and (5) on infotainment rack (3).
- Pivot rack into luggage compartment until connectors at navigation system with CD drive control unit J401 are accessible.
- Release and unplug connector at MOST bus.
- Fit protective cap for cable connectorVAS 6223/9(1) onto MOST bus connector (2).
- Release and unplug remaining connectors at navigation system with CD drive control unit J401.
- Insert two radio release tools T10057 into release slots on navigation system with CD drive control unit J401 until they engage. Pointed ends of tool grips must face outwards.
- Pull the navigation system with CD drive control unit J401 out of the rack.
- Press release tabs on navigation system with CD drive control unit J401 and remove radio release tool T10057.
- Insert navigation system with CD drive control unit J401 into mounting frame until it engages.
- Install in reverse sequence of removal.
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
- Dismantling and assembling drive shaft – Audi Q5
- Removing and installing intermediate steering shaft
- Removing and installing rear axle steering rack – Audi Q7
- Renewing brake caliper - ceramic brakes – Audi A6/A7 C7
- Removing and installing radiator (centre) – Audi A6 C6
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.