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A 2000 year Guangzhou Honda accord 2.3 L car, the left front door master switch device can not control the left rear door glass lifting, but the left rear door glass lift switch can be controlled. The author thinks that there is no fault in the mechanical part of the left rear door glass elevator. It should focus on checking whether the wiring harness between the main control switch device and the multiple control device of the door exists short circuit or circuit breakage. Through multi-party detection, it is determined that the fault occurs on the integrated circuit board related devices in the vehicle door multi-channel control device.