Shanghai BMW maintenance/Shanghai maintenance technology which one is the best?

Shanghai Xinchehui Industrial Co., Ltd. professionally repairs Mercedes-Benz, BMW and Porsche
Trouble phenomenon: The left rear of the vehicle has dropped to the bottom and the handbrake light on the instrument panel is always on, and the electronic handbrake fails
Fault diagnosis and troubleshooting Connect the vehicle to the diagnostic computer , the diagnosis computer displays the fault code
Control unit internal fault engine circuit
Control power supply internal fault engine circuit
Interface
Adjustment time fault rise
Double-click the fault code to find all The fault codes are all currently existing. It can be determined that there is a fault with the system, and the fault should be checked first.
Click vehicle test, enter the single-axle air spring control unit, enter the control component, and use the computer to control the motor to inflate the left rear air spring. After inflating, it is found that there is an obvious air leakage sound from the left rear wheel, and the vehicle is raised. It was found that there were obvious cracks in the left rear air spring. If you touch the crack with your hand, there is air leakage. It is confirmed that the damage to the air spring is the cause of the lowering of the left rear of the vehicle. It is recommended that the customer replace the air spring.
Next, continue to use the computer inspection module and enter the inspection plan. There is a reminder about the wiring harness. The content is that vehicles shipped before the year and month have defects in the wiring harness. If the installation is not standardized, the wiring harness will be damaged. wear and tear. Check the wiring harness according to the instructions above. No irregularities in installation or wear are found, so the inspection plan is ended.
Enter the detection plan for internal faults in the control unit. Check that the communication with the control unit is normal. Test the control unit. No other faults are found. Turn off the ignition switch, pull out the plug, and check the pins. There is no damage. Use a multimeter to measure the power and ground pins on the plug, and the measurement results are normal. At this point, it can be judged that the control unit is damaged, and the customer is recommended to replace the control unit.
Summary of faults The above two faults are relatively common faults in BMW vehicles, and in the two systems where the faults occur, the system structure is relatively simple, and the difficulty of diagnosing the fault is not high, but attention should be paid to the assembly Standardization, such as the installation of air spring pipelines and the installation of wiring harnesses. Improper installation may cause damage to related hardware or shorten the shelf life of updated components.
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