Storage, Storehouse, Warehouse
A canopy is over your car because your car is in storage in a large storehouse.
The canopy just protects your car from the elements as it sits in storage for long periods of time.
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Your car is in this storage warehouse, just sitting there. A 子 (こ) notices this, and decides to take your car on a joyride. You won't notice, right? You never drive it.
Imagine a kid sneaking into your canopy to steal your car that's in storage. Maybe it's two 子s, one stacked on the other with a trench coat. One 子 works the pedals while the other 子 works the steering.