Front Door Power Window Operation
The front window motors only operate when the accessory delay relay is active. The high current required to move the front windows are supplied through dedicated B+ and motor ground inputs.
The window control switch(es) sends 2 separate signals to the window motor: up and down. When the window control switch is pressed to the first detent position, a 12-volt signal is sent to the window motor to request an up or down operation. When auto up or auto down is requested (switch pressed to the second detent position), the window control switch provides a 12-volt signal on both the up and down line simultaneously. During an auto up or auto down request, the window motor determines intended window direction by the signal first received. If the window control switch is pressed too quickly to the second detent position (less than 5 milliseconds of time between first detent signal and second detent signal), the window motor is not be able to determine the intended direction request and does not operate until the window control switch is released and pressed again. The up and down contacts are floating within the window control switch when the switch is in the neutral position. The up and down feeds to the window motor are all low current.
When the front window motor is operating in auto or manual mode and the window control switch is held in the opposite direction, the glass movement pauses for a half second, then changes direction.
The front window motors have a security override feature. If an obstacle is detected in the window opening as the window glass is moving upward, the window motor automatically reverses direction and moves the glass toward the bounce-back position (in both manual up and one-touch up modes). Once the window motor stops the glass at its bounce-back position, and within 2 seconds the switch is released, then held in the auto UP position, the window motor moves the glass up with no bounce-back protection (security override). If the switch is released before the window glass reaches the fully CLOSED position, the window motor stops with bounce-back automatically enabled for the next window up movement. If the ignition is turned to OFF or START (without delayed accessory), the window motor stops. The only exception is when an obstacle is detected in the window opening while delayed accessory power is not present. In this case the window motor bounces back, then stops. Ice, contaminant buildup and environmentally induced tight spots in the front window seals are all possible conditions that can activate the bounce-back feature. If an obstruction occurs between 4 mm (0.15 in) and 200 mm (7.87 in) of window opening, the bounce-back position is 250 mm (9.84 in) of window opening. If an obstruction occurs at a position more than 200 mm (7.87 in) of window opening, the bounce-back position is 50 mm (1.96 in) below where the obstruction occurred.