Symptom:The customer said that the boot could not be opened and closed automatically after collecting the new car only a few days ago. During the inspection, he found that the boot would move slightly when he pressed the boot open button, and the same was true when he pressed the internal close switch.
Troubleshooting:After confirming the fault, the technician diagnosed that there was 801715 boot start operating device, and the left hall sensor 2 was short circuited to the negative pole or open circuited.Considering this car is a new one, the technician first deleted the fault code and reinitialized the boot, but the initialization failed.Perform re diagnosis. The DTC reappears.Call the HKL control module to check the contact switch of the trunk lock block and the internal and external switches on the trunk, and the signals can be correctly identified.After simply checking that the signals of the relevant switches are normal, it can be determined that the car really has a fault.The possible causes of this fault code are: damage of hall sensor, short circuit or open circuit of signal wire, module failure.According to the circuit diagram (as shown in Figure 1), measure the signal from the module to the hall sensor as follows:
Figure 1 Trunk lid lifting mechanism circuit
◆ The resistance from A43 * 2B PIN3 to M88 * 1BPIN3 is 0.02 Ω, and the resistance to ground is infinite
◆ The resistance from A43 * 2B PIN4 to M88 * 1BPIN4 is infinite, and the resistance to ground is infinite
◆ The resistance from A43 * 2B PIN5 to M88 * 1BPIN5 is 0.02 Ω, and the resistance to ground is infinite
According to the above measurement results, it can be determined that there is an open circuit in the A43 * 2B PIN4 to M88 * 1B PIN4 wires. It is not easy to determine where this wire is broken, because the harnesses are integrated together.First, we checked the part of the wire harness clip and found no abnormality. Next, we inserted a pin into the middle part of the wire and measured it to see which part was not connected. In this way, we measured it bit by bit. Finally, we found a white spot on the appearance of the harness. We pulled the harness gently and disconnected it, as shown in Figure 2.Finally, after repairing the harness and initializing the boot, the test run is normal.
Figure 2 Harness Fault Location
Fault summary:If any fault is found, the module cannot be disassembled or exchanged blindly. The fault code should be analyzed, and the fault point should be judged by the fault code and fault phenomenon.Eliminate unnecessary operations as far as possible, reduce workload and customer dissatisfaction caused by disassembly and assembly, and avoid component damage caused by operation errors.
Brand Specialty: (Keyword:The trunk of 2014 BMW 525Li can't be automatically switched on and off to repair the trunk and harness, as shown in the figure)
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