1991 Acura Integra Hazard lights do not work

My 91 Integra's hazard lights stopped working. The fuse box lists a location for the hazard fuse, but there is not a corresponding slot in that location. In any case, I have checked all fuses in the underdash and underhood fuse boxes and they are all OK. I understand the turn signals and hazard lights share the same flasher unit and have located it near the steering column. The turn signals work fine. When I depress the hazard switch, the turn signals turn off. Does this sound like a problem with the flasher unit? Is there a way to test the flasher unit? I would appreciate any insight into my problem. I hate to buy a $40 flasher unit if this isn't the problem.