This morning I noticed that istop on my CX3 was not working. Even though this is the first time I've noticed this, I assumed it was due to our cold winter weather (the temp. reading was 7 degrees Celsius). When I parked at work and switched the engine off, I noticed a green key light with an exclamation mark in the middle dash just under the speedo. This light only comes on when I press the brakes. Does anyone know what this means? The CX3 manual is quite difficult regarding this.