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The central control door lock system of Shanghai general Buick GL8 commercial vehicle consists of many components, and the central control door lock system interacts with the remote control system. Once the central control door lock system fails, if it does not understand its control process, it will be difficult or difficult to repair it. The author briefly introduces the control process of the middle control door lock system in light of the failure cases in the actual work, and discusses the maintenance diagnosis idea with everyone, hoping to bring convenience to everyone's work.