Communication with the CUV control unit
Check whether the CUV control unit has generated any fault codes. Check the connection between the yellow CAN bus and the CUV control unit. Check the CUV control unit supply voltage circuit (30) and the CUV 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 CUV control unit (visibility system) has been interrupted.
The fault may be due to: Fault in the CUV control unit connection to the yellow CAN bus. Short circuit or open circuit in the CUV control unit supply voltage. Internal fault in the CUV control unit.