I've just had new winter tyres fitted to my 2013 Honda CRV. I was advised that the tracking was incorrect so I had a 4 wheel laser check to correct the alignment. On the first straight road after the fitting the "check tyre pressures" warning light illuminated. I understand that this system works on the rolling diameter of the wheels and is picked up by sensors in the diffs. The tyre pressures were correct, the garage reset the warning from the drivers seat.
Is it normal that tyre changes trigger the warning system, and why should the warning system activate. It hasn't previously activated.