Description:

The error code ETC 000923.19 is triggered when the outputs for switching the fan motors (M07 and M10) are energized by more than one control unit. This indicates a conflict in the control signals being sent to the fan motors, which can cause erratic behavior or malfunction.

Reaction:

When this fault is detected, the control unit may disable the fan motors to prevent damage and ensure safe operation. This will result in reduced cooling efficiency.

Recommendations:

Inspect CAN BUS Network:

• Check Control Units: Identify and verify the control units that are sending signals to the fan motors. Ensure that only one control unit is responsible for energizing the fan motors.
• Inspect Wiring and Connections: Check the wiring and connectors between the control units and the fan motors for any signs of cross-wiring or incorrect connections. Repair or replace any faulty wiring.

Update and Reconfigure:

• Software Updates: Apply any available firmware or software updates to the control units to ensure they are operating with the latest fixes and improvements.
• Reconfigure Control Units: Reconfigure the control units to ensure that only one unit is authorized to control the fan motors. This may involve adjusting settings or reprogramming the control units.

Test and Replace Components:

• Test Control Units: Verify the operation of the control units involved in energizing the fan motors. Replace any control units that are malfunctioning or sending incorrect signals.

Note:

Maintaining a reliable and properly configured CAN BUS network is critical for vehicle operations. Regular inspections and timely updates of the control units can help prevent communication errors and conflicts in control signals.