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Home >> GMC >> 2021 >> Terrain SL >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Vehicle Access System >> Diagnostic Information and Procedures >> Exterior Door Handle Switch Malfunction >> Circuit/System Description
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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
B27 Door Handle Switch The switch has a normally open contact. When the switch is activated, the signal circuit to the control module is grounded.
K84 Keyless Entry Control Module The keyless entry control module communicates via serial data with the body control module and the auxiliary body control module.
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