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Home >> GMC >> 2021 >> Yukon AT4 >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Secondary And Configurable Customer Controls >> Diagnostic Information and Procedures >> Drive Mode Switch Malfunction >> Circuit/System Description
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Circuit/System Description

The S126 Ride Control Switch is a normally open switch that closes when the switch is pressed. The K9 Body Control Module monitors the switch on signal circuit 2203. The S126 Ride Control Switch uses circuit 1449 for a low reference. When the drive mode select switch is not pressed, the switch is open and signal voltage observed by the K9 Body Control Module is high. When the drive mode select switch is pressed, the switch is closed and signal voltage observed by the K9 Body Control Module is low.