Dust off the vehicle body after you drive. Regularly inspect your vehicle for scratches on painted surfaces. A scratch on a painted surface can result in body rust. If you find a scratch, promptly repair it.
Honda Civic Owners Manual. Auto Door Locking/Unlocking
Your vehicle locks and unlocks all doors automatically when a certain
condition is
met.
Auto Door Locking
Drive lock mode
All doors lock when the vehicle’s speed reaches about 10 mph (15 km/h).
Auto Door Unlocking
Driver’s door open mode
All doors unlock when the driver’s door is open ...