The rectangle light on the left of my check control panel is an overheat lamp (i have seen a few different versions with seat belt lights, air bag lights etc). I pulled the cover of the check control out to fix a defective led for the washer fluid and realised there are no bulbs behind the overheat light. So i pulled the backlight bulb out and put it in the overheat socket and pressed the check button and it did not turn on. Does the overheat lamp light up when you press the check button or is that only for the led's? and if not how do i test the overheat lamp?