Cracked windscreen in my 2023 Suzuki Swift

In modern cars with bonded windscreen, the glass is actually a structural part of the car. Therefore, if the car cops a big enough impact (say, hitting a pothole at speed) it’s conceivable that the stress passing through the whole car could cause a crack in the glass. Stress cracks in windscreens are usually fairly straight and will emanate from the edge of the glass.

The other way to crack a windscreen is to subject it to extremes of temperature. Pouring boiling water over an icy windscreen on a cold morning is a great way to crack the glass, but high interior temperatures in hot weather can also cause cracking in extreme cases.

Suzuki, like just about every other car-maker has a list of things that aren’t covered by warranty, including batteries, tyre, brakes pads and, as you’ve discovered, glass.