openinverter forum

Posted: **Wed Mar 12, 2025 12:55 pm**

INTRODUCTION

from the guy who's brought you way too many "Now What" Series threads already, comes one more

How it all began? Well I simply wanted to know if the "Resolver Cables" were interchangeable between the 3rd Gen (2007-2011) and the 4th Gen (2013-2018) Lexuseses GS450 heitchers. So I made a low ball offer on eBay for one of the technically called Engine Wire 4th Gen harnesses and it was accepted. Wow, this is way too easy I thought so I did the same for a 4th Gen inverter, and that was accepted. Then I spied with my little eye that the seller was located 2.8 miles away from my house and I could save $400 bones on shipping by picking up a transmission [pronounced: "gearbox'] myself so I made a low ball offer on that, hoping deep inside they would decline the offer. A few minutes later: "Thanks, Greg! Your order is confirmed. We’ll send an update when it’s on the way." and here we are

Posted: **Wed Mar 12, 2025 12:56 pm**

TABLE OF PRICES

* prices includes taxes and shipping where applicable

PART	PRICE	PART #	SOURCE	SELLER	COMMENT
transmission/oil pump/HV cables	$435	30910-30110	eBay	benzeenautoparts	local pickup
inverter	$131		eBay	benzeenautoparts	local pickup
oil pump controller	$98		eBay	jettasworld	free shipping
transmission wire harness	$136		eBay	benzeenautoparts	local pickup
inverter wire harness					still needed
drive shaft					still needed
clutch plate					still needed
TOTAL	$800

Posted: **Wed Mar 12, 2025 12:56 pm**

QUESTIONS

Please feel free to shed some light on these if you have the answers or ideas, let's make this a collaborative effort.

What model years do these parts come from?
- 2012 - 2018

Are the resolver cables interchangeable between the 3rd and 4th gens?

Is the inverter wire harness/plug interchangeable between the 3rd and 4th gens?
- No

Are the fat orange high voltage transmission to inverter cables interchangeable between the 3rd and 4th gens?

Can the 3rd gen inverter control the 4th gen gearbox/transmission?

Can the 4th gen inverter control the 3rd gen gearbox/transmission?

Can a Prius inverter control the 4th gen gearbox/transmission?

Is this 4th Gen inverter CAN Bus controlled?

Can I use the clutch plate off of a different Lexus model to lock the input shaft?

Can I run/drive the car on only MG2 or do I need to use both motors?
- Yes, you can drive the car using only Motor Generator 2, that's how it's done in the OEM implementation. MG1 does not power the rear wheels in it's default factory setup.

Can I use a drive shaft from a different Lexus model?

Is the 3 prong flange on the front of the drive shaft the same as at the rear of it?
- No, the flanges are slightly different, but enough no to be interchangeable.

Does this transmission require an external oil cooler?
- No, some even come from the factory with the two oil cooler lines blocked off with special bolty bolts.

How much does this Lexus GS450h transmission weigh?

How much does the Lexus GS450h inverter weigh?

Posted: **Wed Mar 12, 2025 12:57 pm**

LESSONS LEARNED

when you buy the transmission make sure it has the oil pump with it, they can cost more than the gearbox itself

when you buy the transmission make sure it has the two fat orange HV cables attached to it and they are not cut off on one end, they can cost a $100 bucks a piece by themselves

when buying the inverter look for and be willing to spend a bit more money on one that comes with the black low voltage plug/connector and a bit of a pig tail, that inverter plug is part of the biggest harness in the vehicle and runs through the firewall and is a bear to remove from the car and can cost upwards of $500 duckets itself

it appears there is a new trend on eBay where sellers will reach out to you the buyer with discounts and offers, however for this to happen you need to add the items to your watch list, for example it does not hurt to add like 3 different inverter listings to your eBay account and just wait for the sellers to reach out to you offering price reductions

take advantage of the or Best Offer listings, it helps to include a polite comment when submitting your low ball offer (you get three shots at an offer so don't waste them) say something to complement the seller "hey I really like how you posted so many pics of the item" be genuine, also it helps if you say hey I am converting a car to electric can you help me

be cautious of a new trend on eBay (and by new I mean it's been around for over a decade) it goes something like this, a devious seller will post a $300 dollar item such as an inverter for an exorbitant amount, for example $1,600 dollars to make their artificially over inflated price of $600 seem like a good deal, be patient and do your research, the good deals are out there !

Posted: **Wed Mar 12, 2025 12:57 pm**

RESOURCES

PART NUMBERS

Transmission
30910-30110

Inverter
G92A0-30020

2013 Engine Wire Harness (Transmission Wire Harness, the one with the resolver cables, Safety Neutral Switch plug, and Solenoid plug)
82121-30G30

Posted: **Wed Mar 12, 2025 2:23 pm**

transmission listing as seen on eBay

Orange Cables - ✔

Electric Oil Pump - ✔

It's always nice to see the vehicle it came out of, and seeing it being immobilized because it was wrecked, otherwise it may have mechanical issues

Posted: **Wed Mar 12, 2025 3:58 pm**

inverter listing as seen on eBay

Posted: **Wed Mar 12, 2025 3:59 pm**

4th Gen oil pump controller as seen on eBay

Part Number is G116730030 and fits 2013-2019

Posted: **Sat Mar 15, 2025 12:49 am**

transmission wire harness as seen on eBay

4th Gen transmission wire harness Part # 82121-30G30 is for 2013-2016 this one has the resolver cables but not the inverter connector/plug

Posted: **Sat Mar 15, 2025 1:07 am**

and so it begins...

Posted: **Sat Mar 15, 2025 10:29 pm**

I believe on the Gen 3s the weight was 289 lbs and 40lbs for the inverter. Just for comparison's sake.

Posted: **Sat Mar 15, 2025 11:13 pm**

MattsAwesomeStuff wrote: ↑Sat Mar 15, 2025 10:29 pm I believe on the Gen 3s the weight was 289 lbs and 40lbs for the inverter. Just for comparison's sake.

Brother Matt, did you just look at my watch and told me what time it was, LoL, how very consultant of you! JK

Lexus 30910-30110 Transmission Assy, Hybrid Vehicle

Lexus G92A0-30020 Inverter Assembly, Hv Mo

Posted: **Tue Mar 25, 2025 4:33 am**

Hey Greg,

Thanks for your efforts and videos on this topic.

I have a running 2013 GS 450H, I would happy to assist with CAN logs etc to help work out the protocol to these inverters (once I figure out how to do can logging).

It is RHD, so the CAN logs may need to be read backwards or possibly with a mirror....

Cheers

Posted: **Thu Mar 27, 2025 8:56 pm**

Gregski wrote: ↑Wed Mar 12, 2025 12:56 pm QUESTIONS

Please feel free to shed some light on these if you have the answers or ideas, let's make this a collaborative effort.

Can I use the clutch plate off of a different Lexus model to lock the input shaft?

Can I run/drive the car on only MG2 or do I need to use both motors?
Yes, you can drive the car using only Motor Generator 2, that's how it's done in the OEM implementation. MG1 does not power the rear wheels in it's default factory setup.

Well, on the clutch plate, I have this one which fits the splines and has a nice solid centre with (I think) 16mm holes that would bolt up nicely to a locking bar. https://www.ebay.co.uk/itm/404811804324

I'm also wondering about using MG2 only. Someone else on here said that the VCU needs the resolver data from both MGs but I'd like to completely remove MG1 (and possibly shorten the case as well).

Would also like to lock the PSD (or weld the oil pump gear to the ring gear) so as to run on mech pump only and dump the elec pump.
Also need to lock in high gear (as mech pump wouldn't engage until moving and not at all in reverse).

Just subbed to your YT so will be following this with interest.

Edit: I should note that I'm using a GEN3 trans.

Posted: **Thu Mar 27, 2025 9:29 pm**

nino500 wrote: ↑Thu Mar 27, 2025 8:56 pm Well, on the clutch plate, I have this one which fits the splines and has a nice solid centre with (I think) 16mm holes that would bolt up nicely to a locking bar. https://www.ebay.co.uk/itm/404811804324

I'm also wondering about using MG2 only. Someone else on here said that the VCU needs the resolver data from both MGs but I'd like to completely remove MG1 (and possibly shorten the case as well).

Would also like to lock the PSD (or weld the oil pump gear to the ring gear) so as to run on mech pump only and dump the elec pump.
Also need to lock in high gear (as mech pump wouldn't engage until moving and not at all in reverse).

Just subbed to your YT so will be following this with interest.

Edit: I should note that I'm using a GEN3 trans.

thank you for the assist on the clutch disc I think using Toyota parts instead of Lexus may be the way to go, also you may find this I just bought a 6th Gen Toyota Camry Hybrid Inverter - Now What companion thread useful as it deals with the 3rd Gen Lexus transmotor, and I apologize for starting all these separate threads but I do like granularity and don't want it to get all buried in one deep hay stack

Posted: **Sat Mar 29, 2025 10:35 am**

'I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?'

Has no one suggested a 5th?

Buy a whole gs450h either early one i.e. the one that your never quite sure if it's ugly orthe later style one that just looks like everything else... Ditch the engine put bi battery in it and you can ditch your speed ticket machine aka Hyundai

Posted: **Sat Apr 05, 2025 3:44 am**

stuffs about to get real ! Vroom, Vroom... [or somethin' like that]

Posted: **Sat Apr 05, 2025 4:21 pm**

Gregski wrote: ↑Wed Mar 12, 2025 12:55 pm INTRODUCTION

from the guy who's brought you way too many "Now What" Series threads already, comes one more

How it all began? Well I simply wanted to know if the "Resolver Cables" were interchangeable between the 3rd Gen (2007-2011) and the 4th Gen (2013-2018) Lexuseses GS450 heitchers. So I made a low ball offer on eBay for one of the technically called Engine Wire 4th Gen harnesses and it was accepted. Wow, this is way too easy I thought so I did the same for a 4th Gen inverter, and that was accepted. Then I spied with my little eye that the seller was located 2.8 miles away from my house and I could save $400 bones on shipping by picking up a transmission [pronounced: "gearbox'] myself so I made a low ball offer on that, hoping deep inside they would decline the offer. A few minutes later: "Thanks, Greg! Your order is confirmed. We’ll send an update when it’s on the way." and here we are

IMG_0554.JPG

Posted: **Tue Apr 08, 2025 10:06 pm**

*squints*

Previous post contains no info.

Posted: **Fri Apr 18, 2025 2:38 pm**

nino500 wrote: ↑Thu Mar 27, 2025 8:56 pm Well, on the clutch plate, I have this one which fits the splines and has a nice solid centre with (I think) 16mm holes that would bolt up nicely to a locking bar. https://www.ebay.co.uk/itm/404811804324

Just a note on this. I updated the GS450H wiki with some application info for clutch discs that fit the splines on these transmissions (I happened to have an old clutch disc from a Toyota 3B/H55F and it slid onto the front of my L110F (LS600HL). (From my thread viewtopic.php?p=81572#p81572)

Posted: **Fri May 23, 2025 3:08 pm**

scored an inverter and wire harness from the Fourth Generation 2013 Toyota Avalon Hybrid (model years: 2013-18) which looks awfully the sameish as the Lexus one, let's hope the inverter plug is interchangeable

looks like somebody already snagged the fuselator

here I am attempting to remove the already severed orange high voltage motor cables (but I end up giving up on removing them as it appears 6 bolts need to be undone and I have a strict 3 bolts or less per component policy, ha ha )

Posted: **Fri May 23, 2025 3:13 pm**

and here she is all extracted an hour and fifteen minutes later

snagged all the wire harnai

note the handsum carrying handle (hey it's the pants or the inverter, you decide)

I can take apart 92% of all imports with what's in that Pick N Pull tool bag!

Posted: **Fri May 23, 2025 3:16 pm**

and back in the lair

Lexus gearbox tethered to the Lexus inverter, and the Toyota inverter on the floor

Posted: **Mon Jun 16, 2025 5:46 pm**

so a little progress update, I managed to find a 4th Gen oil pump on eBay ($432) so I snagged it just so that I can have a nice proper uncut OEM oil pump wiring harness to test with

Posted: **Mon Jun 16, 2025 5:49 pm**

and immediately after allowing it to sit on my garage floor for 6 months I decided to swap it

so out with the circumcised one!

openinverter forum

I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

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Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?

Re: I just bought a 4th Gen Lexus GS450h Powertrain. - Now What?