Preheating control unit: Notes

The preheating control unit contains the power output stages for activation of the heater plugs. The preheating control unit does not have its own fault memory. Faults in the preheating system that are detected by the preheating control unit are reported to the DDE by the preheating control unit across the LIN bus. The faults are then stored in the DDE fault memory.

If the permitted operating temperature of the preheating control unit is exceeded, the preheating control unit shuts down any preheating process to prevent damage.