What does it mean when the PCS yellow light is on in a Toyota vehicle?
2 Answers
This indicates the Pre-Collision Safety System. Here are the details: 1. Introduction: Toyota's Pre-Collision Safety System is called Pre-Collision-System, abbreviated as PCS. Its luxury brand Lexus was one of the first to apply the pre-collision safety system to mass-produced vehicles and has always been at the world-leading level. 2. Development: The PCS Pre-Collision Safety System first appeared in the 2003 Lexus LX and RX models. The sensor for this system is a millimeter-wave radar installed at the front of the vehicle. This radar can automatically detect obstacles ahead and calculate the possibility of a collision. If the system determines that a collision is highly likely, it will sound an alarm to alert the driver to take evasive action. At this point, other active safety devices will also be integrated, and the Brake Assist (BA) will enter a ready state to assist the driver in braking the vehicle.
I was quite anxious when I saw the PCS yellow light on my Toyota, as it indicated an issue with the pre-collision system. That time, I was driving my Toyota Camry on the road, and after the rain, the sensors got dirty, causing the yellow light to come on. The system warned that collision assistance was temporarily unavailable, which could affect safety. I immediately stopped and simply cleaned the radar area at the front of the car, but it didn’t help. I had to go to the 4S shop for a check, and it turned out to be dirt blockage. They performed a professional calibration, which cost around two to three hundred yuan to fix. It’s advisable to pay attention to the cleanliness of the car body before driving, especially the camera areas, as dirt can cause the system to falsely trigger the yellow light. In short, never ignore this light when it appears—it’s related to automatic braking and warning functions. Delaying action might lead to an accident. Now, during monthly maintenance, I make it a habit to clean the sensors, which helps reduce trouble.
