F 250 2WD Pickup V6-4.2L VIN 2 (1998)
Power Window Control Module: Description and Operation
The Generic Electronic Module (GEM) controls the opening of the LH driver side power window (window down motion) by activating the one touch
down window relay.
Down window motion operates in two modes. manual mode and auto mode. When the GEM detects the first down position, first detent on the switch, it
enters manual mode. In manual mode, the window will move downward only while the switch is depressed. Similarly, when the GEM detects the second
down position, second detent on the switch. it enters auto mode. In auto mode. the window will open completely with just a momentary press of the
switch.
The power window system will operate only if:
-
The ignition switch is in the RUN or ACC position, or
-
The delayed accessory feature is in the active mode. There are two modes of operation for the power window system:
Manual Mode:
When the LH window regulator control switch is pressed to the first detent position, the window will move down until one of the following conditions is
met:
-
The LH window regulator control switch is no longer in the first detent position.
-
The LH window regulator control switch is pushed to the One Touch Down (OTD) position causing the windows to enter auto mode.
Feature Input:
-
LH window regulator control switch, first detent position.
NOTE: Delayed accessory feature must be active.
Feature Output:
-
One touch down relay coil output (grounded when activated, open circuit when deactivated).
Auto Mode:
Auto mode provides the One Touch Down feature (OTD feature). The OTD feature is activated when the LH window regulator control switch, for the
LH window, is pressed to the second down position, second detent.
Auto mode will be terminated when any of the follow conditions are met:
-
The LH window regulator control switch is pushed to the up position.
-
The LH window regulator control switch is released (OFF position) and then moved to the down position (first detent) or OTD position (second
detent).
-
Seven seconds have elapsed since auto mode was initiated.
-
A window regulator electric drive stall condition is detected on the one touch down sense line inputs.
Feature Inputs:
-
LH window regulator control switch inputs; refer to the LH Window Regulator Control Switch Table.
NOTE: Delayed accessory feature must be active.
-
One touch down sense lines, high and low (voltage difference corresponds to window current).
Feature Output:
-
Down window relay coil output (grounded when activated, open circuit when deactivated).
One Touch Down Relay
The GEM controls manual down and OTD window movement with the one touch down relay.
The relay is activated by applying ground directly to one side of the down window relay coil, and is deactivated by removing the ground signal.
