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How to Solve BCM Faults in Cars?

2 Answers
Harvey
08/30/25 4:08am
The MCU periodically samples the voltage through the ADC port to calculate the working current of the load. Connect the ADC input to the comparator's input, and link the comparator's output to the MCU's interrupt capture IO port. For example, a rising edge interrupt indicates a short circuit.
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DelHope
09/11/25 8:09am
As an experienced driver who frequently deals with car repairs, I've encountered BCM issues several times. That time, after the rain, the windows wouldn't open, and upon inspection, I found that loose battery terminals caused voltage instability, making the BCM act up. First, I turned off the power and checked the fuses—fortunately, none were blown. Then, I used an OBD scanner to read the error codes, which indicated a software glitch. I tried a power reset: disconnecting the negative battery terminal for 10 minutes before reconnecting it, which solved the simple issue. If the hardware is damaged, the only solution is to replace the module, which can cost over a thousand. Remember not to ignore this situation, as it affects door locks and lighting safety. I regularly dry the engine bay to prevent moisture. Developing a habit of checking the dashboard warning lights before driving can help avoid major troubles.
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