What does this sentence mean? It's about car.?

Question

Cornering triggers door-ajar dash light, signalling torsional rigidity of a silk blouse on a washing line.

Answer 1

I own a shop, and have a degree in industrial engineering. Torsional Rigidity; refers to the bodies ability to not flex when an apposing force is applied (such as G-force) to the structural pillars (bones) of the assembly. When the inner frame of the vehicle flexes under G-force, the result is a waving effect on the skin of the structure ie; blouse on a washing line. If you have ever seen a drag race car when it launches off the line, the G-force on the structure will cause the right side of the vehicles skin to wrinkle, and in some cases burst the windows out of the vehicle. A door Ajar light is set off by the contacts (that keep the circuit complete) is broken when it encounters too much G-force in the area that the switches are placed. Funny enough is the fact they already thought of this. They put springs in the contacts that are designed to keep them in place, even during the G-force maneuver that separates the two components of the assembly. Sometimes these springs aren't strong enough, and/or the contacts become corroded. A spray can of contact electronic cleaner can be purchased at a parts store for this. Once they are clean, add a tiny bit of lithium grease to the contacts, and the problem will go away.
Glad to help you, Good Luck!!!

Answer 2

It means that when the car corners hard, the frame is flexing pretty bad, in this case allowing the door to separate from the body just enough to allow the door ajar light to come on.