Circuit/System Description
The rear fuse block monitors the voltage level on the supply voltage circuit of the REAR DEFROST relay. The voltage level should be low while the REAR DEFROST relay is de-energized. The voltage will be near system voltage when the rear fuse block energizes the REAR DEFROST relay.
The instrument panel cluster (IPC) monitors the voltage level in the rear window defog indicator control circuit. The voltage level should be low while the rear window defog indicator is illuminated and the voltage will be near system voltage when the rear window defog indicator is not illuminated.
The front power windows are controlled by the driver window switch, front passenger window switch and the rear fuse block. The driver window switch contains the master power window switch that controls all power window operations. When a power window switch is activated to a desired position, power window switch will send a signal to its respective door window motor to move the window to the desired position. The window motors may also receive a signal from the rear fuse block to globally express down.
The front power windows are controlled by the driver window switch, front passenger window switch and the rear fuse block. The driver window switch contains the master power window switch that controls all power window operations. When a power window switch is activated to a desired position, power window switch will send a signal to its respective door window motor to move the window to the desired position. The window motors may also receive a signal from the rear fuse block to globally express down.
The instrument panel cluster (IPC) monitors the voltage level in the rear window defogger switch signal circuit. The voltage level should be low when the rear window defogger switch is open and the voltage will be near system voltage when the rear window defogger switch is closed.
The front power windows are controlled by the driver window switch, front passenger window switch and the rear fuse block. The driver window switch contains the master power window switch that controls all power window operations. When a power window switch is activated to a desired position, power window switch will send a signal to it's respective door window motor to move the window to the desired position. The window motors may also receive a signal from the rear fuse block to globally express down.
When the rear defogger button is pressed a signal is sent to the rear fuse block which then supplies a ground to the REAR DEFROST relay coil. The instrument panel cluster illuminates the rear window defogger indicator. B+ voltage is supplied at all times to the REAR DEFROST relay. This allows battery positive voltage from the relay switched input through the switch contacts and out the relay switched output to the rear window defogger. Ground for the rear defogger grid is provided by G403.
The front power windows are controlled by the driver window switch, front passenger window switch and the rear fuse block. The driver window switch contains the master power window switch that controls all power window operations. When a power window switch is activated to a desired position, power window switch will send a signal to it's respective door window motor to move the window to the desired position. The window motors may also receive a signal from the rear fuse block to globally express down.
The each power window is controlled by their respective window switches front and the driver master control contains power window switches that controls all power window operations. When a power window switch is activated to a desired position, power window switch will send a signal to it's respective door window motor to move the window to the desired position. The window motors may also receive a signal from the rear fuse block to globally express down.
The rear window switches also receive voltage from the driver window switch lockout control which permit normal window operation from the rear window switches.
Rear Power Window Lockout Operation
The driver power window switch contains a window lockout switch. The window lockout switch completes or interrupts the window lockout control circuit. If the window lockout switch is enabled, there is no voltage available at the rear power window switches and rear power window will not operate from the rear power window switches. The rear power windows will operate from the driver power window switch.
Rear Window Defogger Operation
When the rear defogger switch pressed, a signal is sent from the HVAC control assembly to the instrument panel cluster, the instrument panel cluster then sends a serial data message to the rear fuse block. The rear fuse block interprets as a request for the rear window defogger system. The rear fuse block enables the rear window defogger system by supplying ground to the REAR DEFROST relay coil. With the relay energized, battery positive voltage is allowed from the relay switched input through the switch contacts and out the relay switched output to the rear window defogger grid. Ground for the rear window defogger grid is provided by G403.