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CAN Bus troubleshoot

Old 02-04-2019, 07:20 AM
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Default CAN Bus troubleshoot


I'm trying to fix a problem in the CAN bus ( U1900 and other node missing etc...)

I have 12.7 V on ignition off

I have 2.7 V on CAN_H and 2.4 V on CAN_L which seems to be good

But when i mesure the resistance between H and L , i have 0 ...

is it possible ? or my DVOM is dead ? ( or at least , not having his ohmmeter function ...)

Also , i don't seem to find the main connectors wiring, its like a big cube ... with many wires, one on right up from fuse box , and one on left, i don't find the name

Old 02-06-2019, 06:12 AM
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It's you DVOM or how you use it - think about it: you can't have different CAN_H & CAN_L if the ohms are zero.
Old 02-10-2019, 08:25 AM
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Unless you have an SDD and know how to use it you are just shooting in the dark.
It's just WAY to complicated to try and troubleshoot a CAN bus with stone age tools.
Old 02-11-2019, 03:45 AM
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I have SDD ... i bought a new power supply 30 A 9mv ripple , reinstalled SDD, removed firefox ( SDD works better with Internet Explorer)

I ordered some piercing probes / Needle probes

Also I ordered new DVOM , i found 60 ohm between pin 6 and 14 from Data Link Connector and correct voltage

Next step is to test the CAN lines continuity between ABS/DSC module ( on MY2009 there seems to be only 1 module refered as DSC module) Junction Box

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