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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Body & Frame >> Exterior Body Panels >> Bolted Exterior Body Panels And Closures >> Diagnostic Information and Procedures >> DTC P257D-P257F: Engine Hood Switch >> Circuit/System Description

Circuit/System Description

The Starter/Generator Control Module applies B+ to the hood ajar signal 2 circuit and monitors the voltage to determine the position of the hood. The hood ajar switch contains a multiplexed resistor. This resistor will vary the voltage seen by the Starter/Generator Control Module by pulling down the applied voltage based on the position of the switch.