Fault memory

Faults that occur during operation are stored in a non-volatile memory (e.g. EEPROM). The faults remain in the memory even if terminal 15 and terminal 30 are not live. The fault memory is designed in such a way that the occurring faults, data source, fault type and error erase counter can be saved. The vehicle electrical system control module is powered directly from the vehicle electrical system battery and via terminal 30 for the interior light. The direct power supply and the power supply via the interior light are protected by two separate fuses. If the fuse for the direct power supply is faulty, a fault is stored in the fault memory. The vehicle electrical system control module is still powered via terminal 30 for the interior light and is fully functional. If the interior light fails, this fault is not stored in the fault memory because this is evident from the lack of lighting. The vehicle electrical system control module sends messages and checks the CAN comfort cyclically for messages from other control modules. If no messages are received for a certain time period, a fault is stored in the fault memory.