93 Sundance reverse lights not working

I have a 93 Sunadance that the reverse lights will not come on. Also the airbag warning light is on and the radiator fan is not running. All three of these are together on one fuse. That fuse is good. I tested several different good ones. The reverse bulbs are good. Everything else electrical works just fine. What else could be causing the problem??

I dont have a schematic , so im not sure...it may be the bodyground .A quick check is use a jumper from neg side of battery to the body( you can use jumper cable ), a lot of people check for power and not the ground. current needs a path to ground to compleat the curcuit. hope this works .....pass the word about this site

I have a 92 and had the problem with the radiator fan.... On mine it turned out to be the computer starting to go out.... not cheap but could have been worse...