VCDS Release 11.11 PDF Manual Printing Instructions: - Ross-Tech
VCDS Release 11.11 PDF Manual Printing Instructions: - Ross-Tech
VCDS Release 11.11 PDF Manual Printing Instructions: - Ross-Tech
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
<strong>VCDS</strong> – Optical Bus Diagnostics - Section 29-A<br />
The [Optical Bus Diagnostics] function found in the Applications Screen is used on<br />
models with a MOST bus to narrow down the location of a break in the network. Many<br />
control modules will be completely inaccessible via conventional diagnostics if there's a<br />
break in the MOST bus.<br />
The above example shows a 4F Audi A6 with a break in the MOST bus. In this case, it's<br />
clear that the modules are all electrically OK, but the Optical bus is broken between the<br />
Sound System module and the Voice Control module.<br />
You may change the Diagnostic Type from "Standard" to "3dB Attenuation" if your results<br />
are not conclusive. The attenuation means all modules are sending with less output<br />
(initiated by the MOST master), but the individual MOST participating control modules can<br />
attenuate individually to check if individual modules are responsible for problems.<br />
VW/Audi sells a handy loop of fiber (part number 4E0 973 802 ) that can be used in place<br />
of each of the components in the system. This can be used to check whether a component<br />
is responsible for breaking the loop.<br />
Click on [Start] to begin checking the controllers on the bus.<br />
[Copy] will copy the results to Windows Clipboard. Once you have pressed the Copy<br />
Codes button, you may paste the results into the application of your choice, such as MS<br />
Word or Notepad.<br />
[Save] will save a plain-text report to your PC, typically in this directory: C:\<strong>Ross</strong>-<br />
<strong>Tech</strong>\<strong>VCDS</strong>\Logs<br />
Use [Done, Go Back] to return to the Applications screen.