Brake Lights

Drivers side brake light was not working. Opened light and checked bulb and wires. No power. Followed through fender to trunk connection, no power. Third trunk brake light and passenger brake light working. Then for no apparent reason all three not working. Was using a basic test light checking for power on the white wire with brown stripe. Checked ground wire, ok. Pulled out brake pedal switch and tested as ok. Fuse is ok. Does the pedal switch go to a control module or something which could cut off all three lights?

Thanks.