A mechanic who owns a workshop brought in a Maserati with steering wheel problems. The symptoms appeared to be related to the CanBus communication of the module. To verify this, he used the CanBus Multiplex Trainer tool since the scanner showed no visible faults. With the trainer's AI Diagnostic Suite, he was able to view vehicle data, ECU calibration, and live data along with freeze frames.
After visualizing the behavior of the hexadecimal data, it was confirmed that the frame was communicating with each of the modules, but not specifically with the steering wheel module. Upon directly testing this module, the internal transceiver was analyzed and found to have a problem with the microcontroller. It was replaced with another transceiver, the module was reinstalled, and everything worked perfectly.
Finally, through freeze frames, it was determined that the failure occurred when the vehicle had 0 rpm and an 8.7v battery in the switch on, that is, when the battery was completely discharged and the charge was generated with the battery charger connected to the car, a short circuit occurred in the module that caused the failure.
