Inverter pump relay/fuse location

The text and illustrations from the Repair Manual (more info) are available in the Chilton Library database, to which your local public library offers access at no charge.

For the inverter water pump assembly, control and power supply are separate. Power (+BWP, blue wire) comes from the IGCT NO. 3 fuse in the Engine Room Junction Block Assembly. That fuse is fed, along with other loads, from the IGCT relay in the same place; there isn’t a relay dedicated to the inverter water pump. Ground (GND, white wire with black stripe) is via ground point A3. The control (drive) signal (SWP, green wire) comes from the Power Management Control ECU, to which a speed signal (NWP, pink wire) returns.

See the System Circuit section of the Electrical Wiring Diagram for all the details; note that all four circuits go through the Ag1 wire-to-wire connector. In the Repair Manual, see the sample waveforms for IWP and NIWP in the Terminals of ECU pages for the Hybrid Control System and the information for diagnostic trouble codes P0C73-776 and P314A-828.

 

The 10A IGCT 3 provides 12V power to the inverter water pump. The IGCT relay provides power to that fuse.

 

I'm trying to replace the inverter pump too. This is my first time working on a 3rd gen. I am a lot more familiar with my 2nd gen. Where is the inverter pump located on the 3rd gen? Any help is greatly appreciated. Thanks!

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