Method and system for controlling an electrical system

A control system for a vehicle comprising a first electrical system operating at a first voltage and a second electrical system operating at a second voltage, the second voltage being higher than the first voltage, the control system comprising:

• a fault detection unit comprising a processor or programmable logic device that detects a fault in the second electrical system or to detect a crash situation;
• and
• an electrical system control unit comprising a processor or programmable logic device that:
• disconnects a power source of the second electrical system;
• determines that the fault of the second electrical system is no longer present or that the crash situation is resolved;
• reconnects the power source to the second electrical system and increasing the voltage of the second electrical system from zero to an intermediate voltage lower than the second voltage;
• and
• if a detected current in the second electrical system is higher than a current threshold value;
• or
• if a detected voltage of the first electrical system is higher than a voltage threshold value;
• reduces the voltage of the second electrical system to zero.