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Home >> GMC >> 2018 >> Terrain SL >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Memory Modules >> Secondary And Configurable Customer Control System >> Diagnostic Information And Procedures >> Drive Mode Switch Malfunction (GMC) >> Circuit/System Description

Circuit/System Description

For an overview of the component/system, refer to Drive Mode Description and Operation (GMC) 

Circuit Description
5 V Reference Regulated voltage supplied by the control module.
Signal The control module input circuit has an internal resistance connected to ground.
Ground Chassis Ground
Component Description
K20 Engine Control Module The control module contains a microprocessor used to process input data to control outputs.
S126 Drive Mode Select Switch The switch S126 has an internal resistor ladder network. A specific resistance is generated dependent on the position of the switch.
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