92 corolla brake lights -parking Problem?

My son's brake lights are working fine but none of the parking lights come.

Any ideas?

I had a nissan that did this once and it turned out to be the switch.


Is there anyway to determine if this is the cause?

Any other things that could cause this ?

Thanks much

Sounds like it could be either or:
1. The bulbs disfunctional
2. The fuse burned out
3. Electrical problem