After connecting to VIDA, clearing codes, and test driving, these Diagnostic Trouble Codes (DTCs) remain: BCM-0040 (Wheel sensor, right rear faulty signal), CEM-1C06 (Alternator Control Module (ACM) Electrical fault), CEM-9C03 (Antenna/light ring Signal missing), CEM-DD21 (LIN-bus 2 Signal missing), CEM-DD30 (Communication with ACM module Signal missing), and SUM-0041 (Suspension position sensor, rear right Signal too low). The wheel sensor and suspension sensor issues are pre-existing and likely unrelated to the current electrical problem.
Focusing on the ACM errors, voltage readings at the battery terminals showed a steady 13.7V with no fluctuations at varying RPMs and remained stable at idle with lights on, ruling out alternator overcharging.
Suspecting grounding issues, various chassis grounds under the hood were cleaned and reconnected. However, upon restarting, the engine cranked briefly then stopped, even with the key in the start position. Furthermore, warning lights remained illuminated even with the key removed. Disconnecting the ignition switch connector yielded no change. Disconnecting the battery ground cable was the next step to prevent further electrical issues. A possible cause could be a stuck relay, supplying power to unintended circuits. Troubleshooting continues.
