Lost part while trying to reinstall my HV battery.

It is PNC 82675C - TERMINAL, JUNCTION

Part number 82675-47080

 

No Problem.

FYI, in the second photo above, that part is shown being installed upside down. The two dimples should contact the wire shields, not roll over them.



This shows the correct orientation.

 

You could probably make one with some thin metal... But I bet you find the one you lost if you remove the backseat bottom. They tend to end up down there when taking a pack apart.

 

It's not worth it; they cost less than $3 to buy a new one.

 

Depends on your location and how much time, money and effort it takes to get that part... And this particular part is likely to make near zero difference if you install the pack without it, but I'll let @ChapmanF refine that.

And I do have a couple extra and could mail one to OP for free if they send me their address....

 

True, but I'm sure the OP can decide whether any of ths is a factor.

It is an essential component that grounds the cable shielding. Do not leave it off. Also, ensure it is not installed upside down, as this would prevent it from providing the necessary clamping pressure for a proper ground.

 

While I have no reason to not include it, I bet that if we tested it without it'd be fine. My hunch is that its additional redundancy for pack failures. And I'm not remembering it being used at all on Gen3 Prius? I've not worked on as many Gen3 than Gen2 so not certain. And as always, I trust @ChapmanF 's opinion on this subject.

 

Why speculate? Do the testing and report back.

I'd be interested in your testing methodology. To test effectively, one would need to fully inform themselves about the design and function of the system. However, few people take the time to do this, so it often ends up as just one unqualified opinion against another.

 

I think those cable shields are grounded at both ends ... there is also that web of woven shield at the inverter end that connects to the outside of the connector at the inverter and should be grounded through the inverter case.

So the cable shields probably show as grounded on a meter even if the grounding clamp is missing at the battery end.

Nonetheless, it's clear Toyota wanted them grounded at both ends. You can find examples in Prius wiring harnesses where they have shielded cable sections variously grounded at both ends or just one end (sometimes between years the engineers change their minds about which end). I had a class where we spent a period on the various engineering reasons for when each of those shielding choices is the right one, but I was, like, 22 then. Long story short, I would make an effort to do it the way Toyota did.

The shields on those cables play a role in the car's constant monitoring for cable damage, which it does by imposing an extra AC signal on top of the DC carried by those wires, and then trying to detect that AC signal elsewhere in the car.