Ford Fiesta Owner's Manual page 53

Lighting
If you set the switch to position B, the
courtesy lamp will illuminate when you
unlock or open a door or the liftgate. If you
leave a door open with the ignition
switched off, the courtesy lamp will go off
automatically after some time to prevent
your vehicle battery from losing charge. To
switch it back on, switch the ignition on for
a short time.
The courtesy lamp will also illuminate
when you switch the ignition off. It will go
off automatically after a short time or
when you start the engine.
If you set the switch to position C with the
ignition switched off, the courtesy lamp
will illuminate. It will go off automatically
after a short time to prevent your vehicle
battery from losing charge. To switch it
back on, switch the ignition on for a short
time.
Reading Lamps
If you switch the ignition off, the reading
lamps will go off automatically after some
time to prevent your vehicle battery from
discharging. To switch them back on,
switch the ignition on for a short time.
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