This article discusses the diagnosis of tail door release switch faults in vehicles, focusing on five common problems and their solutions related to the car tailgate lock. It covers issues such as worn switches, electrical wiring problems, faulty actuators, blown fuses, and software or ECU malfunctions. Each problem is explained with step-by-step solutions to help drivers diagnose and fix their car tailgate lock issues. The article also offers preventive maintenance tips to keep the tailgate lock system functioning smoothly and emphasizes the importance of early diagnosis to avoid further damage and ensure vehicle security.