I’ve gone through the entire car thinking something may have been left on but I don’t find anything. No after-market gadgets.The lights remaining on and auto-stop not working may be indicative of a parasitic draw while the vehicle is not running. There is a small sensor wire connected to the positive terminal that monitors the health of the battery while sitting. If the voltage reduction is greater than expected, the first noticeable change is start-stop will not work the day following the detection of change.
Do you have any after-market devices wired or plugged in such as radar detectors, phone chargers, dashcams either installed by yourself or were in there when you purchased the car? Could be something as simple as a dome light left on. Normally interior lights turn off after 30 minutes or so, but it is worth looking for something.
Does your husband have other tools? Can he check for parasitic drain while the car is sitting? Or, can he check the battery voltage when shutting off the car and then again after a number of hours sitting without running?I don’t see any temp reading when I scroll through the dashboard, just the temp gauge with the needle. I had my husband use the OBDII reader and it showed 200 degrees.
Keep in mind the auto start/stop needs certain parameters to be met for it to work. It doesn't necessarily work 100% of the time during a drive..Last week I had the dealer replace my battery and to my surprise, as I was driving away from the dealership, the auto start/stop engaged and worked all day. I parked the car for 3 days and when I drove it the next time, the auto start/stop no longer works.
Thanks for the clarification.It's not installed by the battery. The bypass is installed behind the hood latch and underneath the cowl. When properly installed with the swift ties it's not visible unless you were actually looking for it.