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Home >> Cadillac >> 2017 >> XT5 Base >> Repair and Diagnosis >> Body & Frame >> Windows >> Fixed And MOVEABLE Window System >> Diagnostic Information and Procedures >> Power Windows Malfunction >> Circuit/System Description
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Circuit/System Description

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

Circuit Description
B+ - S79D Window Switch - Driver Supplied from a fuse.
B+ - M74D Window Motor - Driver Supplied from a fuse.
B+ - M74P Window Motor - Passenger Supplied from a fuse.
B+ - S79LR Window Switch - Left Rear Supplied from a fuse.
B+ - S79RR Window Switch - Right Rear 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 Switch Passenger Down Signal The output circuit is switched to ground to activate the component.
Power Window Switch Passenger Express Signal The output circuit is switched to ground to activate the component.
Power Window Switch Passenger Up Signal The output circuit is switched to ground 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 Left 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.
Power Window Motor Right Rear Down 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 S79D sends a serial data message to the K9 indicating the M74 function that has been requested.
M74D Window Motor - Driver
  • Power Window Control
  • The control module and the DC motor are one assembly.
S79P Window Switch - Passenger The switch has a normally open contact.
M74P Window Motor - Passenger
  • Power Window Control
  • The control module and the DC motor are one assembly.
S79LR Window Switch - Left Rear The switch has a normally open contact.
M74LR Window Motor - Left Rear An electric DC motor.
S79RR Window Switch - Right Rear The switch has a normally open contact.
M74RR Window Motor - Right Rear An electric DC motor.
K9 Body Control Module The module controls various vehicle functions like lighting, central door locking, power windows, etc.
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