did you look at can high and can low wires the passat has a can module and if that breakes down nothing will comunicate with nothing
---------- Post added at 01:21 PM ---------- Previous post was at 01:18 PM ----------
All T5 have a CAN bus system.
2003-2006 it very basic and only covers selected ECU (mostly convenience bus eg door locks and central locking, and a drive train CAN bus engine signals to dashpod)
CAN gateway is located in the dashpod
2006-2010 had a some changes but much the same as the ealier one but with some extras (eg radio connection)
Diagnostics still use the K-line
2010- T5.1 has a full CAN and LIN bus system
Diagnostics are done through the CAN bus
CAN = Controller area network (designed by bosch in the 1980's) - 2 wire system with error correction- runs at 125k to 1mb
LIN = Local interconnect network - single wire system with masters and slave ECU's - low speed and cost
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