Toyota Prius 3rd Gen No. 1 Ultrasonic Sensor RH Assembly

Toyota Prius 3 ^rd Generation (XW30)

No. 1 Ultrasonic Sensor RH Assembly Wiring Guide: DIY Pinout Diagram

What is: The Vehicle No. 1 Ultrasonic Sensor RH is a parking assistance sensor mounted on the right-hand side (RH) of the vehicle’s bumper. It emits ultrasonic sound waves to detect nearby obstacles when the vehicle is moving slowly or reversing. The sensor sends distance information to the parking assist control unit, which then alerts the driver through warning sounds or display messages, helping prevent collisions and improving parking safety.

No. 1 Ultrasonic Sensor RH Assembly (89341-28480-A1)

Front bumper ultrasonic sensor for Toyota Prius 3rd gen parking system

Right-hand ultrasonic parking sensor for Toyota Prius XW30 bumper clearance sonar

Toyota Prius 3rd Gen No. 1 Ultrasonic Sensor RH 89341-28480-A1 front parking assist sensor

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1. Introduction

      The  No. 1 Ultrasonic Sensor RH (89341-28480-A1) in the Toyota Prius is an important component of the vehicle’s clearance and parking assist system. Mounted on the right-hand (RH) side of the bumper, this sensor helps detect nearby obstacles when the vehicle is reversing or maneuvering at low speeds. It operates by emitting ultrasonic sound waves and measuring the echo reflected from surrounding objects to determine their distance from the vehicle. The sensor sends this information to the parking assist control system, which alerts the driver through warning sounds or display indicators. This function helps reduce the risk of collisions and improves parking accuracy. A properly functioning ultrasonic sensor is essential for maintaining safe and convenient parking assistance in the Prius.

1. Related parts and Accessories
   • Clearance Warning ECU Assembly:-Processes signals from ultrasonic sensors and calculates obstacle distance.
   • Other Ultrasonic Sensors :-Front, rear, and corner sensors that detect objects around the vehicle.
   • Clearance Warning Buzzer :-Produces audible alerts when the vehicle gets close to an obstacle.
   • Combination Meter / Multi-Information Display :-Shows obstacle distance and system warnings to the driver.
   • Main Body ECU (Multiplex Network Body ECU):-Communicates with the parking assist system.
   • Steering Pad / Parking Assist Switch :-Allows the driver to enable or disable the parking assist system.
   • Radio & Display Receiver Assembly:-Displays visual parking guidance information.

2. No. 1 Ultrasonic Sensor RH Assembly Wiring Diagram & Pinout

A. Connector Location

• No. 1 Ultrasonic Sensor RH Assembly Position: Mounted on the right-hand side of the front bumper of the Toyota Prius, facing outward to detect nearby obstacles during parking.


• Connector Type:
  • C1 (6 pin) Black housing

B. Wiring Table

No. 1 Ultrasonic Sensor RH (C1)

C1 TERMINALS OF NO. 1 ULTRASONIC SENSOR RH CONNECTOR

Terminal No	Symbol	Wiring (Color Code) & Color	Electrical Paths
C1-1	BI	(Y) Yellow	➔ C2 2 (BO) ➤ [No. 1 Ultrasonic Sensor LH]
C1-2	_	(—) No Color
C1-3	SI	(L) Blue	➔ C2 4 (SO) ➤ [No. 1 Ultrasonic Sensor LH]
C1-4	_	(—) No Color
C1-5	EI	(BR) Brown	➔ C2 6 (EO) ➤ [No. 1 Ultrasonic Sensor LH]
C1-6	_	(—) No Color

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Quick Pin Summary – C1 Connector

Connector: C1 (6-pin, Black housing)

• C1-1 BI (Bus Input) :
  Carries communication signal between RH and LH ultrasonic sensors. Used for synchronized data exchange in the parking assist system. Connected to No. 1 Ultrasonic Sensor LH, Connector C2, Terminal 2 (BO).
• C1-2 Not Used (—) :
  No signal assigned; terminal remains inactive. Not used in circuit operation. No connection.
• C1-3 SI (Signal Input) :
  Transfers ultrasonic signal data between sensors. Used for transmitting and receiving detection signals for obstacle sensing. Connected to No. 1 Ultrasonic Sensor LH, Connector C2, Terminal 4 (SO).
• C1-4 Not Used (—) :
  Transfers ultrasonic signal data between sensors. Used for transmitting and receiving detection signals for obstacle sensing. Connected to No. 1 Ultrasonic Sensor LH, Connector C2, Terminal 4 (SO).
• C1-5 EI (Echo Input) :
  Handles echo return signal for distance calculation. Used to process reflected ultrasonic waves for obstacle detection. Connected to No. 1 Ultrasonic Sensor LH, Connector C2, Terminal 6 (EO).
• C1-6 Not Used (—) :
  Handles echo return signal for distance calculation. Used to process reflected ultrasonic waves for obstacle detection. Connected to No. 1 Ultrasonic Sensor LH, Connector C2, Terminal 6 (EO).

Quick Note: The No. 1 Ultrasonic Sensor RH uses a 6-pin C1 connector, but only three pins (BI, SI, EI) are active. These lines communicate directly with the LH sensor for synchronized ultrasonic signal transmission and echo processing, enabling accurate obstacle detection during parking.