2022 Toyota Redundant Sienna Lane Departure Problems

Your cross traffic alert and blind spot monitoring system became unavailable while driving at 25 mph, even though the weather was dry and there was no visible damage to the sensors. You cleaned the sensors and the warning persisted, suggesting an electrical or software issue rather than a physical obstruction. This will likely require a diagnostic scan and possible replacement of the sensor modules or their wiring.

Mud and debris are entering the inside of your rear bumper, blocking the sensors that power your rear collision warning and blind spot monitoring systems. This happens repeatedly—about every three weeks—because your 2022 Sienna's design allows mud to collect inside the bumper cavity rather than draining away. When the sensors get blocked, both safety systems stop working, and Toyota hasn't provided a solution or maintenance procedure to restore them.

We are not talking about malfunction, since it's underperforming by design. Rcta and BSM don't make any audible alert. Every other vehicle I owned had this.