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