GM Service Manual Online
For 1990-2009 cars only

Express Down Feature

Press the Down position in the left front window switch momentarily past the first defeat in order for the window to reach the FULL-DOWN position. Press the left front window switch to the UP position in order to stop the window.

Lock Out Switch Operation

The left front window switch contains a lock out switch which removes battery voltage from the other window switches. This will not allow the operation of the windows from their individual switches. The windows can be operated as normal from the left front window switch.