Disconnect the 12V battery (on passenger’s side of the firewall in the engine compartment).Unplug the HV disconnect (X) (on the top of the refrigerant compressor on the driver’s side of the engine compartment).First pull the retaining ring (1) upwards, then unplug the HV disconnect (2).SPECIAL CONCERNSPRESSURE RELIEF VALVE (PRV)In the event of a malfunction of the hydrogen pressure regulator in the fuel system, the PRV opens and enables the controlled release of the hydrogen via the vent line into the atmosphere.The pressure relief valve opens at pressures above approx. 16 bar.The protective cap on the outlet of the vent line is blown off by the pressure of the escaping hydrogen.