Red CAN bus
Check the connection between the red CAN bus and the coordinator. Check the red CAN bus cable harness and connectors. Measure the resistance between the coordinator's pin for CAN-High and CAN-Low of the red CAN bus with the battery disconnected. Resistance should be around 60 ohm. (Due to the two termination resistors connected in parallel.) Disconnect the battery. Measure the resistance between the coordinator's pin for CAN-High of the red CAN bus and any other control unit's pin for CAN-High of the red CAN bus. To the EMS control unit, for example. Resistance should be close to 0 ohm. Disconnect the battery. Measure the resistance between the coordinator's pin for CAN-Low of the red CAN bus and any other control unit's pin for CAN-Low of the red CAN bus. To the EMS control unit, for example. Resistance should be close to 0 ohm. Check the coordinator activation signal circuit (15).
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
All communication on the red CAN bus has been interrupted.
Open circuit in the circuit for the red CAN bus.