Rear Window Defogger Description And Operation - Suzuki XL7 2007 Service Manual

Power Window System Controls
The power window system will operate any time the
ignition is the ACC or RUN position. The main power
window switch located in the console contains individual
window switches for each of the power windows. All
windows may be controlled up and down from the main
power window switch. The individual rear passenger
power window switches will only control the up and down
operation of their respective power window.
Power Window Motor Operation
Each power window contains a reversible power window
motor. The direction the window travels is dependent
upon the polarity of the supply voltage. By reversing
polarity of the supply voltage the window motor will move
up or down. Each power window motor is internally
circuit breaker protected.
Main Power Window/Switch Operation
Battery voltage is supplied to the main power window
switch through the accessory voltage supply circuit. The
main power window switch also receives a constant
ground source. The power window motor control circuits
are connected to ground through the normally closed up
and down contacts of the main power window switch.
When the main power window switch is placed in the
down position, the power window motor down control
circuit is switched to 12 volts which is applied to the
down side of the power window motor. Since the other
side of the power window motor is connected to ground
through the normally closed contacts of the up switch,
the window travels down. By placing the power window
switch in the up position, the polarity of the power
window motor is reversed and the window travels up.
Driver Power Window Express Down Operation
If the driver power window switch is pressed
momentarily in the down position past the first detent,
the window will express down to the full open position
when the switch is released. To cancel the express down
operation, momentarily press the driver power window to
the up position.
Rear Passenger Power Window/Switch
Operation
The rear passenger power window switches receive
battery voltage through the power window master switch
lockout signal circuit when the window lockout function is
disabled. Ground for the rear passenger power window
motors is supplied through the normally closed up and
down contacts of both rear passenger power window
switches and the main power window switch. When
either rear passenger power window switch is placed in
the down position, the power window motor down control
circuit is switched to 12 volts which is applied to the
down side of the rear passenger power window motor.
Since the other side of the rear passenger power
window motor is connected to ground through the
normally closed up contacts of both the rear passenger
Glass / Windows / Mirrors:
and main power window switches, the window travels
down. By placing the rear passenger power window
switch in the up position, the polarity of the power
window motor is reversed and the window travels up.
The rear passenger power windows can also be
controlled from the main power window switches.
Power Window Lockout Operation
The main 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 the rear
power windows will not operate from the rear power
window switches. The rear power windows will operate
from the console power window switches.
Rear Window Defogger Description and
Operation
Rear Window Defogger System Components
The rear window defogger system consist of the
following components:
• The HVAC control module
• The body control module (BCM)
• The REAR DEFOG relay
• The rear window grid
Rear Window Defogger Operation
Battery positive voltage is supplied through the REAR
DEFOG fuse, in the underhood fuse block, to the REAR
DEFOG relay switched input. Ground for the coil of the
REAR DEFOG relay is provided by the BCM. Battery
voltage is supplied from the IGNITION 30A MaxiFuse to
the supply voltage on the rear defog relay coil side.
When you depress the rear defogger switch, the rear
defogger switch pulls the signal circuit low as an input to
the BCM. The BCM interprets this as a request for the
rear defogger system. The BCM enables the rear
defogger system by supplying ground to the REAR
DEFOG relay coil. The relay coil ground is also spliced
off to the ground circuit of the rear defogger indicator.
The REAR DEFOG relay is energized and the rear
defogger indicator is illuminated. 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 defogger grid.
Ground for the rear defogger grid is provided by G401.
When you start the engine and press the rear defogger
switch for the first time, the defogger cycle lasts for 15
minutes. Further operation results in 7.5 minute
defogger cycles. The defogger cycle resets to 15
minutes when you cycle the ignition to the off position
and then to the on position.
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