Absence of Yellow bus CAN communication (CAN1 buffer overflow)
• Check connector for yellow CAN-bus on CUV (pin C31 and pin C32). • Check wiring for yellow CAN-bus: - Measure the resistance (with the battery disconnected) between CAN-high (pin C31) and CAN-low (pin C32). 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 on CUV (pin C31) and CAN-high on any other unit on the yellow CAN-bus. It should be close to zero ohm. - Measure the resistance (with the battery disconnected) between CAN-low on CUV (pin C32) and CAN-low on any other unit on the yellow CAN-bus. It should be close to zero ohm. • Check wiring and connector for the ignition signal (pin C24) on the TBD.
What you'll see
Functions dependent on information on the yellow CAN-bus from CUV might be degraded.
System reaction
Amber Visibility warning
Diagnostic depth
Communication error. Yellow CAN-bus buffer overflow. The yellow CAN-bus has an open circuit.
• Defect connectors on CUV for yellow CAN-bus (pin C31 or pin C32). • Defect wiring for yellow CAN-bus, open circuit on CAN-high (pin C31) or CAN-low (pin C32). • Ignition signal (pin C24) on CUV is short circuit to supply.