I have to replace the motor in the driver's side window. How can I set things so that when I push the button to go down once, that the window goes all the way down automatically? I know if it's not done right, the window will only go 1/4 of the way down or so rather than the whole way like it's supposed to.

1991 300d 214k

On the R129 SL with slight window drop to clear the weatherstrip when the door is opened, you press and hold the up button then the control knows it is full up.

Also, the down portion of the switch has 2 positions, the first is controlled down and the second auto down.

I believe you hold the button for the window to go down and once down continue holding the button for 5 additional seconds. That should do it I think.

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92 e300d2.5t
01 e320
05 cdi
85 chev c10