I believe all of those functions may be controlled by the same fuse. A few weeks ago, my turn signals weren't working, and the heater blower wasn't working. I have a manual transmission, so I didn't have to worry about the gear lock for park. Anyway, the problem was with a fuse in the fuse box under the dash. I can't remember the fuse number. I want to say 23, but that's just a guess, and I don't have the car with me to check. The fuse wasn't blown, but it wasn't making good contact. I'm going from memory now, but I believe the fuse is labeled as controlling the reverse back up lights.
Hope this helps.
