Toyota prius 3rd gen Seat Inner Belt Assembly (R4)(W5)

Toyota Prius 3 ^rd Generation (XW30)

Seat Inner Belt Assembly Wiring Guide: DIY Pinout Diagram

What is:A vehicle Seat Inner Belt Assembly is the fixed seat-belt component mounted beside the seat, usually attached to the vehicle floor or seat frame. It includes the buckle, anchoring bracket, and wiring for seat-belt warning sensors. Its main role is to securely lock the seat belt tongue, ensure proper restraint during a collision, and trigger safety alerts if the belt is not fastened.

Seat Inner Belt Assembly (73210-47100-B1) (73220-47090-B1)

Toyota Prius 3rd gen right-side seat inner belt assembly (73220-47090-B1)

OEM Toyota Prius seat belt buckle with sensor connector

Toyota Prius 2010–2015 seat inner belt assembly components

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1. Introduction

      The  Toyota Prius 3rd Generation Seat Inner Belt Assembly (LH: 73210-47100-B1, RH: 73220-47090-B1) is a key safety component designed to ensure secure seat-belt engagement and reliable occupant protection. Mounted on the inner side of the front seats, it includes the buckle, anchor mechanism, and an integrated seat-belt reminder sensor. These assemblies play a vital role in detecting proper belt fastening, supporting supplemental restraint systems, and maintaining overall passenger safety. Built to meet Toyota’s strict durability and crash-safety standards, these OEM parts ensure precise fitment, smooth operation, and long-term reliability. They are essential for proper seat-belt performance and accurate communication with the vehicle’s safety control modules.

1. Mechanical Parts component
   • Buckle Housing: – Encases the locking mechanism.
   • Latch Mechanism: – Locks the seat belt tongue securely.
   • Release Button:– Allows the belt to be unlatched.
   • Mounting Bracket: – Attaches the assembly firmly to the seat frame.
2. Electronic/Control Devices component
   • Buckle Switch (Seat Belt Switch): -Detects whether the seat belt is fastened.
   • Wiring Harness/Connector: – Connects the buckle switch to the vehicle’s Airbag ECU or Occupant Detection ECU.
   • Seat Belt Warning Indicator:– Controlled by the ECU to alert the driver/passenger if the belt is unfastened.
   • Occupant Detection ECU (for passenger side): – Uses the buckle switch signal along with seat weight sensors to determine airbag deployment conditions.

2. Seat Inner Belt Assembly Wiring Diagram & Pinout

A. Connector Location

• Seat Inner Belt Assembly Position: The Seat Inner Belt Assembly is positioned on the inner side of the seat, beside the seat cushion and next to the center console.
• Connector Type:
  • R4 (4 pin) White housing
  • W5 (2 pin) gray housing

B. Wiring Table

Seat Inner Belt Assembly Assembly (R4) (W5)

W5 TERMINALS OF Front Seat Inner Belt Assembly RH CONECTOR

Terminal No	Symbol (Pin Definition)	Wiring (Color Code) & Color	Electrical Paths
R4-1	1	(V) Violet	➔ R1 12 (LBE-) [Center Airbag Sensor Assembly]
R4-2	2	(G) Green	➔ R1 11 (LBE+) [Center Airbag Sensor Assembly]
R4-3	3	(G) Green	➔ R1 13 (LSP-) [Center Airbag Sensor Assembly]
R4-4	4	(R) Red	➔ R1 14 (LSP+) [Center Airbag Sensor Assembly]

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W5 TERMINALS OF Front Seat Inner Belt Assembly LH CONECTOR

Terminal No	Symbol (Pin Definition)	Wiring (Color Code) & Color	Electrical Paths
W5-1	1	(G) Green	➔ W3 9 [Occupant Detection ECU]
W5-2	2	(P) Pink	➔ W3 5 [Occupant Detection ECU]

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