Toyota prius 3rd gen Inverter Water Pump Assembly (g1)

Toyota Prius 3 ^rd Generation (XW30)

Inverter Water Pump Assembly Wiring Guide: DIY Pinout Diagram

What is: A vehicle inverter water pump assembly is an electric pump that circulates coolant through the inverter, converter, and motor electronics in hybrid and electric vehicles. It removes excess heat generated by high-voltage components, keeping them within safe operating temperatures. Proper cooling ensures efficient power conversion, prevents overheating, and helps protect sensitive electronic parts from damage.

Inverter Water Pump Assembly (G9040-47090)

Prius XW30 inverter cooling system water pump

OEM Toyota inverter water pump assembly for Prius 3rd gen

Toyota Prius 3rd generation inverter water pump assembly G9040-47090

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1. Introduction

      The  Toyota Prius 3rd Generation Inverter Water Pump Assembly (G9040-47090) is a vital component in the vehicle’s hybrid system, designed to manage the cooling of the inverter and power electronics. This electric pump ensures efficient circulation of coolant to regulate the temperature of high-voltage components, preventing overheating and maintaining optimal performance. Unlike conventional engine water pumps, it operates independently of the engine, providing precise thermal management for the inverter and motor control circuits. Durable and reliable, the G9040-47090 supports the longevity of the hybrid system, enhances energy efficiency, and contributes to smooth operation and improved fuel economy in the Prius 3rd generation.

Related parts and Accessories

• Hybrid Inverter / Converter:-The primary unit cooled by the water pump, responsible for converting DC to AC and controlling power flow between battery and motor.
• Electric Motor / Drive Motor (MG1 & MG2):-High-voltage motors generating heat that requires cooling.
• Hybrid Battery Pack:-Indirectly benefits from stable inverter temperature to maintain efficiency.
• Cooling Circuit Components:-Radiator, hoses, thermostat, and coolant reservoir that circulate and regulate coolant flow.
• ECU / Power Control Unit (PCU):-Monitors and controls pump operation based on temperature sensors.
• Temperature Sensors:-Detect coolant and inverter temperature, providing data for the ECU to adjust pump speed.

2. Inverter Water Pump Assembly Wiring Diagram & Pinout

A. Connector Location

• Inverter Water Pump Assembly Position: Located in the engine compartment on the left side, near the inverter assembly and behind the headlamp.


• Connector Type:
  • g1 (4 pin) Black housing

B. Wiring Table

Inverter Water Pump Assembly (g1)

g1 TERMINALS OF Inverter Water Pump Assembly CONECTOR

Terminal No	Symbol (Pin Definition)	Wiring (Color Code) & Color	Electrical Paths
g1-1	GND	(W-B) White/Black	➳ Ag1 4 ➔ ▼ D2 (Ground Point)
g1-2	NWP	(P) Pink	➳ Ag1 2 ➔ A21 14 (NPP) [Power Management Control ECU ]
g1-3	SWP	(G) Green	➳ Ag1 3 ➔ A21 13 (IWP) [Power Management Control ECU ]
g1-4	+BWP	(L) Blue	➳ Ag1 1 ➔ 1 2 ➤ 10A Blade Fuse [IGCT NO.3]

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