Nina

Check or have someone check the voltage across the battery with the engine
stopped and the engine running. It the voltage should be higher with the
engine running around 13.5 V I think

Did all the bulbs light up for a few seconds when the ignition was turned on
before the fault developed. If they did my guess the problem is to do with
the unit which controls that function.

An awful lot of connection problem in vehicles are to do with the earth
connections i.e the connection to chasis. Please excuse  me but I have no
way of knowing your knowledge level or experience. Electrical circuits
usually need at least two connections to make them work. For basic stuff on
cars like bulbs etc. that often consist of a wire from a switch which is the
positive. The negative is often connected by a  bolt or screw to the chasis
or body of the car to which the negative of the battery is connected.

These earth or chassis connection can easily be not very good because of
paint between the contact and the body, corrosion, rust  etc. If it looks
like there is any rust or dirt in the vicinity undo the connection and clean
both the contact surfaces with some sandpaper or a fine file (used gently).
I had ongoing problems with a mod someone had done to my Trooper caused by a
poor eart contact.

Good Luck

David