Toyota prius 3rd gen Steering Sensor Assembly (L51)

Toyota Prius 3 ^rd Generation (XW30)

Steering Angle Sensor Assembly Wiring Guide: DIY Pinout Diagram

What is: A Vehicle Steering Angle Sensor Assembly measures the steering wheel’s rotation angle and direction. It sends precise steering input data to control systems such as ABS, VSC, ESC, and electric power steering. This information helps the vehicle maintain stability, improve handling, and accurately calculate driver intent during cornering, braking, and traction control operations.

Steering Angle Sensor Assembly (89245-74010)

Prius 2010–2015 steering angle sensor integrated with spiral cable

Skid Control ECU steering angle input sensor on Prius third generation

Toyota Prius 3rd generation steering angle sensor assembly part number 89245-74010

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1. Introduction

      The  Toyota Prius 3rd Generation Steering Angle Sensor Assembly (89245-74010) is a critical input sensor for the vehicle’s stability and safety systems. It accurately detects the steering wheel’s rotation angle, direction, and speed of movement. This data is transmitted to the Skid Control ECU to support Vehicle Stability Control (VSC), Traction Control (TRC), ABS, and Electric Power Steering (EPS) operations. By comparing driver steering input with actual vehicle behavior, the sensor helps maintain directional stability during cornering and sudden maneuvers. Proper calibration of the steering angle sensor is essential after wheel alignment or steering-related repairs to ensure accurate system operation and reliable vehicle control.

Related parts and Accessories

• Skid Control ECU:-Receives steering angle data and controls ABS, VSC, and TRC functions
• Yaw Rate & Acceleration Sensor:-Compares vehicle rotation and lateral movement with steering input
• ABS Wheel Speed Sensors:-Provide individual wheel speed data for stability calculations
• Electric Power Steering (EPS) ECU:-Uses steering angle information to adjust assist levels
• Hybrid Vehicle Control ECU:-Coordinates stability control with hybrid system operation
• Brake Actuator Assembly:-Applies brake force to individual wheels during VSC/TRC intervention

2. Steering Angle Sensor Assembly Wiring Diagram & Pinout

A. Connector Location

• Steering Angle Sensor Assembly Position: Located on the steering column behind the steering wheel, integrated with the spiral cable inside the steering column housing.




• Connector Type:
  • L51 (6 pin) White housing

B. Wiring Table

Steering Sensor (Steering Angle Sensor) Assembly (L51)

L51 TERMINALS OF Steering Sensor (Steering Angle Sensor) Assembly CONECTOR

Terminal No	Symbol (Pin Definition)	Wiring (Color Code) & Color	Electrical Paths
L51-1	_	_	_
L51-2	ESS	(W-B) White/Black	➔ 3A 21 ⇔ 3A 67 ➔ L93 5 ⬌ L93 3 ➔ ▼ L1 (Ground Point)
L51-3	CANL	(W) White	➔ L94 13
L51-4	CANH	(L) Blue	➔ L94 2
L51-5	IG1	(G) Green	➔ 3A 16 ⇔ 3B 76 ➔ 2B 16 ➤ (IG) 10A Blade Fuse [ECU-IG No.2 ]
L51-6	BAT	(R) Red	➔ 3A 24 ⇔ 3B 83 ➔ 2A 49 ⇔ 2C 40 ➔ 1 2 ➤ (BAT) 10A Blade Fuse [ DOME ]

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