Complaint 2229171

Complaint Summary

VISIBILITY/WIPER

Owner Narrative

Vehicle experienced a catastrophic, terminal 12V auxiliary battery parasitic drain that flatlines the system to 0% while parked, creating a severe safety risk by stripping hazard lights and motive power. This is the 3rd identical electrical collapse within 4 weeks; a late June 12V battery replacement failed. The vehicle was in active daily use, not stored.Held out of service at Kings Toyota since July 6, 2026 (26+ days down). Technicians dismantled the cabin and placed the dashboard in the trunk to trace loops. Management confirmed hardware nonconformities in the Data Communication Module (DCM) and Body Control Module (BCM), which fail to enter sleep mode. Observable proof includes continuous, erroneous telemetry alerts stating windows are down/doors unlocked while fully locked and disassembled in the bay.Modules are on indefinite global backorder due to an inherent manufacturing defect. Parts are restricted likely to feed production and the mass rollout for NHTSA Campaign 26V393.DIAGNOSTIC DETAILS:Local tech efforts are directly guided by Toyota Corporate factory engineers who designed the vehicle, as local techs have never encountered this severe issue.Multiple other identical units are grounded on the dealer lot with identical 12V flatline failures.My vehicle (#XXX) is being used instructively by Toyota Corporate to advance understanding and map out repairs for the other units.To capture evading data, I complied with a request to delete the Toyota app from my iPhone so lead tech [XXX] could intercept these failing module notifications to aid factory engineers.Management confirmed that by design, if the 12V drops below 11V, the high-voltage motive battery is supposed to automatically recharge it. Here, the vehicle fails to initiate the loop, or the motive batteries enter a defensive "protective lockout mode," cutting power transfer and flatlining the car. This could contribute to motive battery failure /lockout if the defect continues to draw 12V battery down. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INF

Owner-submitted narrative on file with NHTSA. Complaint narratives are self-reported and have not been verified.