Communication with the ACC control unit
Check whether the ACC control unit has generated any fault codes. If not: Check the connection between the green CAN bus and the ACC control unit. Check the ACC control unit supply voltage circuit (30) and the ACC control unit activation signal circuit (15). Check the green CAN bus cable harness and connectors. Measure the resistance between the coordinator's pin for CAN-High and CAN-Low of the green CAN bus with the battery disconnected. Resistance should be around 60 ohm. (Due to the two termination resistors connected in parallel.)
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Communication between coordinator and ACC control unit has been interrupted.
The fault may be due to: Open circuit in the circuit for the green CAN bus. Short circuit or open circuit in the ACC control unit supply voltage circuit. Internal fault in the ACC control unit.