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Circuit/System Description

WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.

For an overview of the component/system, refer to Power Windows Description and Operation 

Circuit Description
B+ - M74D Window Motor - Driver Supplied from a fuse.
Ignition Supplied from a fuse.
Power Window Switch Driver Down Signal The output circuit is switched to ground to activate the component.
Power Window Switch Driver Express Signal The output circuit is switched to ground to activate the component.
Power Window Switch Driver Up Signal The output circuit is switched to ground to activate the component.
Power Window Motor Passenger Down Control The output circuit is switched from ground to 12 V to activate the component.
Power Window Motor Passenger Up Control The output circuit is switched from ground to 12 V to activate the component.
Power Window Motor Left Rear Down Control The output circuit is switched from ground to 12 V to activate the component.
Power Window Motor Left Rear Up Control The output circuit is switched from ground to 12 V to activate the component.
Power Window Motor Right Rear Down Control The output circuit is switched from ground to 12 V to activate the component.
Power Window Motor Right Rear Up Control The output circuit is switched from ground to 12 V to activate the component.
Ground Chassis Ground
Component Description
S79D Window Switch - Driver The assembly on the driver side has one switch for the driver window and one switch for the passenger window. Each switch has 2 outputs, one for window down and one for window up. The motors contain electronics that interpret the up/down signals and actuate the motors accordingly. The circuits for the motor in the driver door are directly wired to the motor. The circuits for the window in the passenger door first go to the passenger window switch and then to the motor. In the inactive position the switch on the passenger side passes on the two control signals as they are. When actuated, it switches one of the control circuits to 12 V.
S79P Window Switch - Passenger The assembly on the driver side has one switch for the driver window and one switch for the passenger window. Each switch has 2 outputs, one for window down and one for window up. The motors contain electronics that interpret the up/down signals and actuate the motors accordingly. The circuits for the motor in the driver door are directly wired to the motor. The circuits for the window in the passenger door first go to the passenger window switch and then to the motor. In the inactive position the switch on the passenger side passes on the two control signals as they are. When actuated, it switches one of the control circuits to 12 V.
S79LR Window Switch - Left Rear The assembly on the driver side has one switch for the driver window and one switch for the passenger window. Each switch has 2 outputs, one for window down and one for window up. The motors contain electronics that interpret the up/down signals and actuate the motors accordingly. The circuits for the motor in the driver door are directly wired to the motor. The circuits for the window in the passenger door first go to the passenger window switch and then to the motor. In the inactive position the switch on the passenger side passes on the two control signals as they are. When actuated, it switches one of the control circuits to 12 V.
S79RR Window Switch - Right Rear The assembly on the driver side has one switch for the driver window and one switch for the passenger window. Each switch has 2 outputs, one for window down and one for window up. The motors contain electronics that interpret the up/down signals and actuate the motors accordingly. The circuits for the motor in the driver door are directly wired to the motor. The circuits for the window in the passenger door first go to the passenger window switch and then to the motor. In the inactive position the switch on the passenger side passes on the two control signals as they are. When actuated, it switches one of the control circuits to 12 V.
M74D Window Motor - Driver
  • Power Window Control
  • The control module and the DC motor are one assembly.
M74P Window Motor - Passenger An electric DC motor.
M74LR Window Motor - Left Rear An electric DC motor.
M74RR Window Motor - Right Rear An electric DC motor.
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