1990 Buick Lesabre Two Electrical Problems

Thank u in advance 4 your assistance: First electrical problem: No low and medium speed blower. Blower works on high setting. Have replaced resistor and heating/AC switch to no avail. Can not find any bad fuses in fuse block on driver's side. Not sure about the fuses on the passenger side. Second electrical problem: ECM has set a hard code for cam sensor though the car runs fine. Replaced cam sensor and disconnected battery to clear code. No difference. The check engine light remains on and stored code is the same. Car will run fine. What gives? I'm out of ideas. Any assistance you can offer would be GREATLY appreciated!