Communication with expansion unit C is interrupted or missing.
• Check power supply and ignition signal to the expansion unit C • Check CAN connection to expansion unit • Check wiring and connectors for the expansion CAN-bus • Measure the resistance (with the battery disconnected) between pins CAN_H and CAN_L. It should be approximately 60 ohm (one 120 ohm termination resistor in each end of the CAN-bus).
What you'll see
No driver-visible symptom recorded.
System reaction
• Functions dependent on the expansion unit are degraded. Which functions that are affected depends on the bodybuilders construction of the electrical system.
Diagnostic depth
Communication error. Communication with the expansion unit C is interrupted or missing.
• Power supply to expansion unit C has failed • Expansion unit C disconnected from the expansion CAN bus