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: factory workshop procedure.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
📋 Procedure
Removing and installing
navigation system with CD drive control unit
J401
, MMI basic (up to week 35/08)
The
navigation system with CD drive control unit
J401
is located in the glove box.
Special tools and workshop equipment required
Radio release tool
T10057
Protective cap for cable connector
VAS 6223/9
Switch off all electrical equipment.
Remove ignition key.
When renewing control unit, select
“Replacement”
function for appropriate control unit in
“Guided Fault Finding”
.
To do so, use the
vehicle diagnostic, testing and information system
VAS 5051
.
Removing
WARNING
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
.
A service flap for changing the air conditioning system pollen filter is fitted to the bottom of the glove box. The connectors on the
navigation system with CD drive control unit
J401
can be unplugged after removing the service flap.
If there is no service flap fitted, the glove box must be removed
General body repairs, interior
Rep. Gr.
68
.
The service flap
A
is secured at the bottom of the glove box
B
by 4 retainers
C
. Moderate force may be required to release the retainers.
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 connector
VAS 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
.
Installing
Plug in connectors.
Insert the
navigation system with CD drive control unit
J401
into mounting frame until it engages.
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
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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.