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Home >> GMC >> 2021 >> Terrain SLT, 4WD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Body Interior >> Vehicle Access System >> Diagnostic Information and Procedures >> DTC B3125, B3130, or B3135 >> Circuit/System Description

Circuit/System Description

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

Circuit Description
B+ - Body Control Module Supplied from a fuse.
Control - Driver Door Unlock The output circuit is switched from ground to 12 V to activate the component.
Control - All Doors Lock The output circuit is switched from ground to 12 V to activate the component.
Control - Passenger Door Unlock The output circuit is switched from ground to 12 V to activate the component.
Ground - Body Control Module Chassis Ground
Component Description
A23 Door Latch Assembly The door locks are actuated by a bidirectional DC motor that locks/unlocks the door so that it can not be opened from outside the vehicle (but still from inside).
K9 Body Control Module The module controls various vehicle functions like lighting, central door locking, power windows, etc.
The control module also reads various switches and sensors and makes their values available via serial data.
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