A submergence-responsive switching member driving circuit includes: a driving
unit
for driving a switching member of a vehicle so as to open or close it by means
of a driving current that flows through between two current input-output ends;
a first power terminal for supplying the driving current; relays having exciting
coils and switching contacts Sw1, SW2, which, so long as a control
current flows through the exciting coil, connect each of the current input-output
ends to the first power terminal respectively by means of the switching contacts,
and further there are provided power breaking means for breaking, when submerged
in water, supply of the control current to the first exciting coil of the first relay.
