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Home >> Chevrolet >> 2018 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 69 (Fixed And MOVEABLE Window System) >> Diagnostic Information and Procedures >> DTC B316B: Driver Window Switch >> Circuit/System Description

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.
Power Window Switch Driver Up Signal The output circuit is switched to ground to activate the component.
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.
Ground Chassis Ground
Component Description
S79D Window Switch - Driver The switch has a normally open contact.
M74D Window Motor - Driver
  • Power Window Control
  • The control module also reads various switches and sensors and makes their values available via serial data.
K9 Body Control Module The module controls various vehicle functions like lighting, central door locking, power windows, etc.
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