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Home >> Chevrolet >> 2021 >> Trailblazer L >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Vehicle Access System >> Diagnostic Information and Procedures >> Power Door Lock Key Cylinder Switches Malfunction >> Circuit/System Description

Circuit/System Description

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

Circuit Description
Signal The control module input circuit has an internal resistance connected to 12 V.
Ground 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.
S146 Window/Outside Rearview Mirror Switch - Driver The S146 sends a serial data message to the K9 indicating the A23 function that has been requested.
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