I did check the fuses, the bulbs and anything I could think of. When I took it into the mechanic, he got in, clicked the high beams-they worked, flash to pass, same thing! I left his shop, feeling a bit stupid, got home, clicked high beams, DID NOT WORK! same with flash to pass. Not feeling stupid anymore.
Still not sure what it is. Somehow I'm guessing it has to do with wiring harness somewhere, and related to the speakers. Drivers speaker always works no matter what. The the rest of the speakers work together intermittently on and off. Not related to bumps or rough roads. I can get in one day, all speakers work great-real stereo. Next time I get in, only drivers door.
I had a wiring problem before. Harness above lift gate had broken wires. No brake lights, back up lights, could not lock lift gate with fob. Mechanic pulled wires out of harness, 3 broken wires.$35.oo quick fix. All OK since then.