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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Power Door Locks And Vehicle Access - Diagnostic Information And Procedures (1 Of 2) >> Diagnostic Information and Procedures >> DTC B1578 - Liftgate Close Switch Malfunction >> Circuit/System Description

Circuit/System Description

The K194 Rear Gate Module provides the B70 Liftgate Close Switch with approximately 12V to the signal circuit 4657. Ground is provided by the K194 Rear Gate Module through low reference circuit 4656. When the switch is pressed, the K194 Rear Gate Module will detect the voltage drop in the signal circuit 4657 and will command the power liftgate to perform the CLOSE function.