Answer
Remove all the fuses, relays or service plugs and disable the high voltage battery.
Step-by-step explanation
A hybrid vehicle is the one that uses an internal engine combustion. It uses the combustion engine and a battery electric drive system so as to increase fuel economy and reduce emissions.
While working on this type of a vehicle one needs to take precautions. One should disconnect the both battery voltages. That is the 12 voltage battery and the high voltage battery service. Then remove all the fuses, relays or service plugs,this is to prevent them from from reinstalling them with out your consent.