PCB test method for CAN bus body controller

Abstract

The invention discloses a PCB test method for a CAN bus body controller. A CAN bus test device is employed, an industrial personal computer is connected with an MCU of a BCM via a CAN bus, a storage self-diagnosis code is marked out at a storage area of the MCU of the BCM, the industrial personal computer controls the MCU of the BCM to perform self-diagnosis detection via the CAN bus as a host computer PC, the MCU reads all input port initial states, input port short circuit states, and diagnosis data capable of reading back and transmits the states and the data to the host computer PC for determination, synchronous signals are sent to a non-read-back output data port via the CAN bus and an AI module, data acquisition is realized via the AI module, the data is detected and transmitted to the host computer PC for determination, master control of the signal output of a DO module is realized via the CAN bus by the host computer PC, the detection of an input port of the BCM is conducted by the MCU, and forced output AI module signal detection of an output port is realized via master control of the MCU through the CAN bus by the host computer PC.

Description

technical field [0001] The invention belongs to the technical field of auto parts, in particular to a method for testing a CAN bus body controller PCB. Background technique [0002] Vehicle BCM body controller with CAN bus can be used for body control of cars, buses and commercial vehicles. The input module collects various switching and analog information inputs through the acquisition circuit, the receiving module receives the signal of the control handle unit (lighting, wiper, washing, etc.), the output module is realized by power drive and relay drive, and has a good cost performance. The CAN communication module realizes information exchange with other automotive electronic modules. It mainly realizes the control of body doors, including door locks, various lights, front and rear washing, front and rear wipers, electric windows and other controls. [0003] More and more body electronic devices are applied in the body, making BCM control objects more and more powerful,...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing BCM test system consumes large resources, has complicated circuit layout, takes up a large space, and has large uncertainty in open-loop control. The test of input and output depends on the logic function of the user-end program , the internal information of the MCU cannot be known, and it is easy to cause the problem of unreliable testing

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