Timeout in CAN communication with Forward looking camera (FLC)
• Check the FLC for DTCs. • If DTCs cannot be read from the FLC: - Check CAN connection to FLC unit - Check power supply and ignition signal to the FLC • Check wiring and connectors for the CAN bus • Measure the resistance (with the battery disconnected) between pins B2 and B11. It should be approximately 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 B2) and supply. It should be high ohmic (Mega ohm). • Measure the resistance (with the battery disconnected) between CAN-low (pin B11) and ground. It should be high ohmic (Mega ohm). • Disconnect the other ECU units one at the time from the CAN bus and check if the remaining ECU timeout error codes disappear.
What you'll see
No driver-visible symptom recorded.
System reaction
• Functions using the FLC are degraded
Diagnostic depth
The DTC is set active if the CAN-message GeneralInfoFLCProp has been absent for 680 ms The DTC is set to inactive if the CAN-message GeneralInfoFLCProp is received. The DTC is not set in the following cases: • ignition is turned off • first 2 seconds after ignition on • system voltage is below 22 volt • system voltage is above 30 volt • when the FLC is in initialization phase. This may last for 10 seconds after ignition on.
• Faulty FLC unit • FLC unit disconnected from the CAN bus If all connected ECUs on the sensor CAN-bus present timeout error codes the cause might be: • Defect wiring : - Short circuit between CAN-high and supply voltage. - Short circuit between CAN-low and ground. • Defect ECU unit(s) on the CAN bus.