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Home >> Chevrolet >> 2018 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 64 (Power Door Lock System And Release Systems) >> Diagnostic Information and Procedures >> Power Door Locks Malfunction >> 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 Door Locks Description and Operation 

Circuit Description
B+ - K9 Body Control Module Supplied from a fuse.
Signal The control module input circuit has an internal resistance connected to 12 V.
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 - K9 Body Control Module Chassis Ground
Ground - S13D Door Lock Switch - Driver Chassis Ground
Ground - S13P Door Lock Switch - Passenger 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).
S13D Door Lock Switch - Driver The switch has a normally open contact. When the switch is activated, the signal circuit to the control module is grounded.
S13P Door Lock Switch - Passenger The switch has a normally open contact. When the switch is activated, the signal circuit to the control module is grounded.
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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