CAN bus
â–¶ How to fix
Check wiring for short circuits and open circuits.Check the CAN bus, see Communication problems under Help.Check whether other control units have lost contact with the tachograph.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
Expected CAN-message from vehicle radar missing.
Possible cause
The fault can be caused by one of the following Vehicle radar does not transmit.CAN communication interrupted. Short circuit between CAN High and CAN Low.CAN High short circuited to plus or earth.CAN Low short circuited to plus.