CAN communication bus - Bus off
• Measure the resistance (with the battery disconnected) between CAN-high and CAN-low at the Environment Sensor CAN bus, Sensor CAN bus (vehicles with DAS) or CAN5 bus (vehicles with DAS). It should be close to 60 ohm (one 120 ohm termination resistor in each end of the CAN-bus). • Measure the resistance (with the battery disconnected) between CAN-high and supply. It should be high ohmic (Mega ohm). • Measure the resistance (with the battery disconnected) between CAN-high and ground. It should be high ohmic (Mega ohm). • Measure the resistance (with the battery disconnected) between CAN-low and supply. It should be high ohmic (Mega ohm). • Measure the resistance (with the battery disconnected) between CAN-low and ground. It should be high ohmic (Mega ohm). • Disconnect one ECU unit at the time from the Environment Sensor CAN bus or Sensor CAN bus (vehicles with DAS) and check if the fault disappears.
What you'll see
No driver-visible symptom recorded.
System reaction
Functions dependent on information from the Environment Sensor CAN bus, Sensor CAN bus (vehicles with DAS) or CAN5 bus (vehicles with DAS) are degraded. Examples listed below. - target detection - target selection - path prediction - misalignment detection DIS2 cannot receive or send CAN messages. DIS2 will be degraded. DIS2 target output will be error.
Diagnostic depth
The DTC is set active if there is a detected bus off at the Environment Sensor CAN bus, Sensor CAN bus (vehicles with DAS) or CAN5 bus (vehicles with DAS):.
• Defect wiring of Environment Sensor CAN bus, Sensor CAN bus (vehicles with DAS) or CAN5 bus (vehicles with DAS): - short circuit between CAN-high and CAN low. - short circuit between CAN-high and supply voltage. - short circuit between CAN-high and ground. - short circuit between CAN-low and supply voltage. - short circuit between CAN-low and ground. • Defect ECU unit(s) on the Environment Sensor CAN bus or Sensor CAN bus (vehicles with DAS) .