Well, I connected up a wire to the positive side of the battery and checked each of the two connections on the connector going to the headlight door motor. Each worked perfectly. The doors opened when I touched the Blu/Yel and they closed when I touched the wire to the Red/Blk.
I verified earlier that the relay/headlight switch are working correctly because the power "switched" between the two wires when the headlight switch was turned on and then off. So what else could be the problem?