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Q:

auto window down , drivers door, on 2002 Mercury Grand Marquis

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
how does it work?
(1) Answer
When you depress the button to that second detent, an auto-down relay engages and looks for the motor/regulator to meet the end of its travel. Then the relay kicks off.