Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
General Information: General Description
The Steering Angle Sensor (SAS) uses two sensors (A-sensor and B-sensor) to determine the direction of the rotation of the wheel. The main component of each sensor is LED, photo transistor and slit plate.
The slit plate, which has 45 holes, is installed between LED and photo transistor, and generates signals if the slit plate rotates according to the steering wheel rotation. The steering angle sensor's signals are generated by photo transistor which is driven whenever the light passes through the holes. The HECU receives the steering signals from steering angle sensor by CAN communication and detects the operating speed and the direction of the steering wheel.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.