Communication with the ACS control unit
Check whether the ACS control unit has generated any fault codes. If not: Check the connection between the red CAN bus and the ACS control unit. Check the ACS control unit voltage supply circuit (30) and the ACS control unit activation signal circuit (15). Check the red CAN bus cable harness and connectors. 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 and CAN-Low of the red CAN bus with the battery disconnected.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Communication between coordinator and ACS control unit has been interrupted.
The fault may be due to: Fault in the ACS control unit connection to the red CAN bus. Short circuit or open circuit in the ACS control unit supply voltage circuit. Internal fault in the ACS control unit.