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Home >> GMC >> 2018 >> Terrain SL >> Repair and Diagnosis (Single Page) >> Body & Frame >> Door Locks >> Power Door Lock System And Release Systems >> Diagnostic Information And Procedures >> DTC B396C: Liftgate Mode Switch Circuit Performance Signal Invalid >> Circuit/System Description
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Circuit/System Description

The interior liftgate rotary control switch contains 3 resistors which are in series for the liftgate mode, depending upon which position is selected will determine which combination of resistors are used. The liftgate module monitors the voltage level in the liftgate mode signal circuit, as each mode is selected, the voltage within the signal circuit incrementally drops. It is this method the liftgate module will determine if mode switch is in the manual mode, garage mode or the maximum open mode.