Yellow CAN bus
Check the yellow CAN bus cable harness and connectors. Measure the resistance between the coordinator's pin for CAN-High and CAN-Low of the yellow CAN bus with the battery disconnected. Resistance should be around 60 ohm. (Due to the two termination resistors connected in parallel.) Measure the resistance between the coordinator's pin for CAN-High of the yellow CAN bus and voltage with the battery disconnected. Resistance should be in the order of Megaohms. Measure the resistance between the coordinator's pin for CAN-High of the yellow CAN bus and ground with the battery disconnected. Resistance should be in the order of Megaohms. Measure the resistance between the coordinator's pin for CAN-Low of the yellow CAN bus and voltage with the battery disconnected. Resistance should be in the order of Megaohms. Measure the resistance between the coordinator's pin for CAN-Low of the yellow CAN bus and ground with the battery disconnected. Resistance should be in the order of Megaohms. Disconnect one ECU unit at a time to see if the fault disappears.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
All communication on the yellow CAN bus has been interrupted.
The fault may be due to: Short circuit in the yellow CAN bus. Internal fault on one of the control units on the yellow CAN bus.