Two problems related to fog light switch have been reported for the 2015 Tesla Model S. The most recently reported issues are listed below.
The 12v battery on our 2015 Tesla Model S started failing last November. We were assured that Tesla that it would be safe to drive until they could replace the battery (which took about 2 months). We've come to understand that this is far from accurate. After that, our mcu (the main computer in the car) failed. This is apparently a well known problem that Tesla refuses to fix. When they replaced the mcu we immediately started having issues: 1. The emergency flashers did not work. 2. The computer logs were not available to Tesla to diagnose issues or recover our car if it was stollen. 3. The fog lights stopped working 4. Glove box would not open 5. Screen now has noticeable flicker 6. Car now has charging problems. The issues with the emergency flashers, fog lights, and glove box were able to fixed by a different service center the same day (although I had to drive approx. 30 miles to get to a different service center). The logging issue took about a month or two to fix. The screen flicker and charging issues where the car randomly switches to a different charging level while driving or charging without any error messages, is on-going. I've been back to Tesla over a dozen times, and they ike to charge $100 every visit "under warranty. ".
My vehicle was serviced by Tesla's sunnyvale service center and when returned, they obviously never did a safety test. After driving down the street I found they didn't reconnect several cables, including the fog lights and the emergency flashers. They also disabled several safety features (lane departure warnings, speed warnings, door locks, child locks) without telling me any of this!.