Electrical Error on camera and radar CAN-bus (CAN9)
• Measure the resistance (with the battery disconnected) between CAN-high (pin B5) and CAN-low (pin B14). 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 (pin B5) and supply. It should be high ohmic (Mega ohm). • Measure the resistance (with the battery disconnected) between CAN-high (pin B5) and ground. It should be high ohmic (Mega ohm). • Measure the resistance (with the battery disconnected) between CAN-low (pin B14) and supply. It should be high ohmic (Mega ohm). • Measure the resistance (with the battery disconnected) between CAN-low (pin B14) and ground. It should be high ohmic (Mega ohm). • Disconnect one ECU unit at a time from the camera and radar CAN-bus and check if the fault disappears. • Check connector pins • Check cabling • Check connectors for all ECU:s on the indicated bus. Check for verdigris, broken, unconnected or shorted pins. Disconnect one ecu at a time.
What you'll see
• Several warnings are active in the instrument cluster. • Functions dependent on information from camera and radar CAN bus are degraded. Examples listed below. - Adaptive Cruise Control - Advanced Emergency Brake - Lane Departure Warning
System reaction
No system-reaction text recorded.
Diagnostic depth
No data is transferred on the camera and radar bus. There might be a short circuit or open load on the camera and radar CAN-bus
Defect wiring of CAN-bus: - CAN-high wire open load - CAN-low wire open load - CAN-high and CAN-low open load at the same location - Loss of connection to termination network - 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 CAN-bus. • ECU unit(s) on the CAN-bus communicates with 250 kb/s.