Where is the steering angle sensor installed?
2 Answers
The steering angle sensor is installed on the steering column between the steering lock switch and the steering wheel, consisting of a photoelectric coupling element and a perforated slot plate. The photoelectric coupling element includes a light-emitting diode and a phototransistor, with the perforated slot plate positioned between them. When the steering wheel is turned, the perforated slot plate rotates, and the phototransistor operates based on the light passing through the perforated slot plate. The vehicle's electronic control unit uses this signal to identify the steering wheel's angle, direction of rotation, and speed. After detecting the vehicle's steering signal, the steering angle sensor sends the correct steering command to the electronic control unit, providing a basis for the steering amplitude. The electronic control unit determines the magnitude of lateral force during vehicle steering based on signals from the vehicle speed sensor and the steering angle sensor to control the body's tilt.
Last time my car had steering issues, the mechanic checked and found that the steering angle sensor is usually mounted directly on the steering column under the steering wheel. This position allows accurate detection of the steering wheel's rotation angle, with signals transmitted to the vehicle stability system or electric power steering system. The location is designed close to the steering wheel shaft for real-time monitoring. Normally, we can't see it—it requires removing the steering wheel cover to catch a glimpse, and in most cars, it's positioned right below the steering wheel where the shaft connects. Installing it there mainly reduces signal delay and interference, ensuring the system responds promptly during turns. During regular maintenance, checking for loose wiring here is crucial to prevent sensor failure and avoid triggering the ESP warning light.
