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Home >> Buick >> 2018 >> Enclave Base >> Repair and Diagnosis (Single Page) >> Body & Frame >> Windows >> Fixed And MOVEABLE Window System >> Diagnostic Information and Procedures >> Power Windows Malfunction (Without Express Up/Down Windows) >> Circuit/System Description

Circuit/System Description

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

Circuit Description
Control - Up @ M74 Window Motor The output circuit is switched from ground to 12 V to activate the component.
Control - Down @ M74 Window Motor The output circuit is switched from ground to 12 V to activate the component.
Component Description
S79D Window Switch - Driver The S79D sends a serial data message to the K9 indicating the M74 function that has been requested.
M74 Window Motor An electric DC motor.
S79P Window Switch - Passenger The switch has a normally open contact.
S79LR Window Switch - Left Rear The switch has a normally open contact.
S79RR Window Switch - Right Rear The switch has a normally open contact.
K9 Body Control Module The module controls various vehicle functions like lighting, central door locking, power windows, etc.
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