An Audi A6L 2.4 (C6) with mileage of about 100,000 km MMI black screen, All
about MMI button lights off, and the screen can not be use.
Diagnosis: test fault exists, and no sound, restart the MMI have no
response, use VAS 5054A and latest ODIS 2.2.4 software to test, found
multimedia module have fault code. Use ODIS inside data inquiry function found
that the specific fault as follows:
(1) MOST system fuse damaged;
(2) plus the conversion parts, modified line;
(3) MOST system fiber optic system have fault;
(4) MOST systems some control unit damaged.
Based on the above reasons to fault diagnosis, after check this car without
additional equipment, according ELSA check each insurance, no blown fuses. Use
VAS 5054A check the system, there is no fault memory, MOST system components
communicate properly, but can not normal enter, use guide function loop
diagnostics, display the results as normal. But this time back to the vehicle
self-diagnosis, all MOST control unit are appears no communication static fault
code, because just only J794 have problems will may be cause all components of
the whole system no communication, the remaining components malfunction not
have this phenomenon, suspect that fault should be J794 failure caused, replace
J794, fault is removed.
After replace J1794 then use VAG VAS 5054A to test, found many place have fault
code. At this time just need use VAS 5054A cleaning the fault code is OK.
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