Blind Spot Detection problems of the 2021 Toyota Highlander

Four days after I took delivery of this used vehicle (April 25, 2026), multiple warning lights appeared at once: brake, abs, park, check engine, blind spot monitor unavailable, and rcta off. An independent Toyota dealership diagnosed the vehicle April 27-28, 2026 (approx. 109,000 miles) and found (1) water leaking into the rear hybrid battery area through a sunroof drain "installed incorrectly," causing a brake system control module low-voltage code, starting issues, a headlight only partially functioning on one side, possible air in the brake system, and a musty hvac odor; and (2) blind spot monitor fault code c1ac2 (slave module horizontal axis misalignment) - the blind spot and rear cross-traffic monitoring systems do not function reliably. At a second visit on may 4, 2026, recalibration was unsuccessful; per Toyota procedure the only remaining option is replacing the right-rear blind spot sensor. The technician wrote the cause is a mystery, "whether it be body damage related or electrical short. " Toyota service records show the same c1ac2 code was documented during the selling dealer's own pre-sale inspection, and that in December 2024 another Toyota dealership pulled the rear bumper and found the rr blind spot sensor bracket bent, causing incorrect readings - a recurring safety defect that prior calibrations and repairs have not resolved. Separately, federal safety recall 23v865 (occupant classification sensors; the passenger airbag may not deploy as designed) was open and incomplete when I purchased the vehicle and remains incomplete, and Toyota service campaign 25td01 (rear traction motor cable corrosion) is also outstanding. The defect has been reproduced and confirmed by two Toyota dealerships, reported to the selling dealer in writing, and reported to Toyota's customer-care center. The vehicle is available for inspection upon request. No crash, fire, or injury.

I was driving 50 mph on 28 e in pineville, louisiana when I heard what sound like a gunshot. I pulled over and realized my sunroof exploded.

The rear cross traffic avoidance does not detect a person on a bicycle or motorcycle. The safety sense 2. 5 + was advertised and demoed to detect even a pedestrian walking behind the vehicle. The system on my vehicle does not work as advertised and after taking my vehicle to the dealer was informed by the service manager that the system is "intermittent at best". This is not what Toyota advertises. Dealerships apparently have no signal strength detection equipment to verify proper operation of this system. I have reviewed multiple videos of this system in operation and there were no indications of intermittent failures. I have contacted Toyota customer support and am being ignored.