Removing and installing control unit 1 for information electronics J794 — AUDI
Removing and installing control unit 1 for information electronics J794 on Audi: factory workshop procedure. Full factory text, tools and checks.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
📋 Procedure
Removing and installing
control unit 1 for information electronics
J794
The
control unit 1 for information electronics
J794
is located in the dash panel.
Special tools and workshop equipment required
Fibre-optic conductor repair set
VAS 6223
Protective cap for cable connector
VAS 6223/9
Note
If control unit is to be renewed, select the
“Replace control unit”
function for appropriate control unit in
Vehicle diagnostic tester
.
Removing
Eject any CD that is still in
control unit 1 for information electronics
J794
.
Switch off ignition and all electrical equipment and remove ignition key.
Remove
Climatronic control unit
J255
Heating, air conditioning
Rep. gr.
87
Operating and display unit; Removing and installing operating and display unit
.
Remove bolt
2
on
control unit 1 for information electronics
J794
1
.
Pull
control unit 1 for information electronics
J794
1
out of mounting frame.
Caution
Note the wire routing in the dash panel for the display. When installing, ensure the wiring is correctly routed otherwise it is no longer possible to extend the display.
Release and unplug all connectors at
control unit 1 for information electronics
J794
and at trim panel with switches.
Fit
protective cap for cable connector
VAS 6223/9
1
onto MOST bus connector
2
.
Then trim panel with switches
1
must be detached from
control unit 1 for information electronics
J794
3
.
Removing trim panel
Remove bolts
2
(4x) and detach trim panel with switches
1
from
control unit 1 for information electronics
J794
3
.
Installing
Installation is carried out in reverse sequence; note the following:
Make sure that wiring from
display unit for front information display and operating unit control unit
J685
to wiring harness and
control unit 1 for information electronics
J794
is correctly routed, as otherwise
display unit for front information display and operating unit control unit
J685
does not extend.
Caution
Note the wire routing in the dash panel for the display. When installing, ensure the wiring is correctly routed otherwise it is no longer possible to extend the display.
Tightening torques
Chapter
“
Overview of fitting locations - MMI radio, 8YQ, I8H
”
Chapter
“
Overview of fitting locations - infotainment system, up to model year 2014
”
Chapter
“
Overview of fitting locations - infotainment system, from model year 2015 onwards
”
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.