Adding F/R lockers to 2003 Land Cruiser

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UZJ100 W/ Differential Locker: 42301-60902
 
TheLCProject said:
Id be surprised if the 99 LX was pre-wired. The locker ECU is in the passenger footwell.

That’d be the easiest place to check and you could also verify some of the wiring in the junction boxes there, too. You can also look under the truck and see what wiring for the ABS wheel sensors look like. If you need help with what to look for, please DM and I can assist.

If you haven’t reviewed my video, please do so to see some of the wiring differences I encountered on a 99 LC.

How to RETROFIT an OEM rear locker into 100 Series Toyota Land Cruiser?
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Video is now private, unfortunately, but for anyone else with a US market 99 LX, I believe it is partially pre-wired. I had a locking rear diff axle from a 98 LC installed into my 07/99 LX, and the shop that did the work said that everything was wired up with the exception of the harness that actually connects the rear differential to the truck. The ECU and the wire that connects to the ECU were both there.

I believe this harness is 82164-60530 (at least for me, since I still have AHC) and I'll be placing an order tomorrow.
 
When I added the OEM rear locked axle to my 99 LX I had to source the '4WD ECU' as well as the harness (w/o AHC), a diff lock switch (I chose the 80 style for front & rear control), and one bulb for the cluster (I removed the washer fluid level indicator bulb and used it in the RR locker indicator slot).
Diff lock ECU '4 wheel drive control'89533-60090
OEM locker switch (100 RR only)84725-60030
OEM locker switch (80 RR & FR)84725-60020
rear locker wiring harness w/ ABS w/o AHC82164-60171
bulb, combination meter, type E83120-60020

If you're really feeling fancy, the 98/99 Land Cruiser cluster has a slot for a front locker indicator light despite not having front lockers as an option in the IFS100 (105s had front locker options and the cluster used in the early 98/99 LC must've been cheapest to produce as identical to that of the 105).

Anyway- with some pretty involved parts swapping, one can remove the lower 98/99LC cluster indicator panel and swap it into the 98-02 LX470 cluster. I've got all the parts to do so but I've not really bothered yet- with an eaton/harrop up front, there's no good feedback circuit to tell me whether the locker is engaged or not. All I would really be able to tell is that the switch is flipped to 'FR & RR' which I can tell by feeling it/looking at it...

 
cruiserpatch said:
If you're really feeling fancy, the 98/99 Land Cruiser cluster has a slot for a front locker indicator light despite not having front lockers as an option in the IFS100 (105s had front locker options and the cluster used in the early 98/99 LC must've been cheapest to produce as identical to that of the 105).

Anyway- with some pretty involved parts swapping, one can remove the lower 98/99LC cluster indicator panel and swap it into the 98-02 LX470 cluster. I've got all the parts to do so but I've not really bothered yet- with an eaton/harrop up front, there's no good feedback circuit to tell me whether the locker is engaged or not. All I would really be able to tell is that the switch is flipped to 'FR & RR' which I can tell by feeling it/looking at it...
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That’s the dream, one day…

RPM has done this on a 100, there’s some info on the slots in the lower indicator panel in their Instagram post: RPM Offroad Garage 🔧 on Instagram: "TRIPLE LOCK 100 series!! 99LC with the rear oem locking diff, we added a @eatonperformance front locking diff, installed the 80 series oem locker switch and got the cluster indicator wired up! Google translate came in handy trying to read the back of the instrument cluster! #landcruiser100 #landcruiser100series #eatonperformance #toyotalandcruiser #magicdial #rpmoffroadgarage" - https://www.instagram.com/share/BAEW4wCKSU?fhid=QkFFVzR3Q0tTVQ
 
I put my video back up for you all.

At least on my 99 LC (which was admittedly different than most, the locker wiring going from the passenger footwell across the dash (under the dash pad) and over to the cluster and the switch was not present. I recognize that most LC and LX from 98 and 99 will likely have all this wiring, but mine did not.

You can also quickly check what bulb slot is which by shining a light through the back of the cluster and see what lights up.
 
TheLCProject said:
In the EWD for the rear diff Lock circuit shown in post #99, the rear diff lock switch is only showing two wires coming out: 1) Red/Blue in terminal 1 and Green/Red in terminal 4.

In actuality, there is a white/black (or just white) wire on terminal 2 that's not in the diagram that I can see.

Does anyone know it's function and where it's shown in the diagrams?

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I’m running into this now on my ‘99 LX with an OE LC rear axle swap including the ECU and rear locker rotary switch. Currently trying to prep for an Eaton locker to go in the front.

Long story short, I’m doing a larger interior job and want to get the interior wiring ready for the Eaton, already have the 80 series switch, any reason NOT to splice the wire I’m going to run out to the engine bay into the white wire on terminal 2?

Intuitively this seems okay to me but I wanted to double check just to be sure.
 
I wired my Eaton front to the 80 switch without issue. The 98/99 LC models are actually wired with front locker lights in the cluster (same cluster as the 105).

98/99 LX are not wired for front lockers but everything is there for the rear.

FWIW the connector provided by Eaton/Harrop in the kit failed on me within a few months of use. I highly recommend using Toyota waterproof connectors or soldering the wires for the front locker together if you want it to engage.

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Rear locker light position in '98 LX cluster

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'99 LX with re-pinned locker switch connections

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'99 LX with grounding blank inserted. '4WD ECU' required for rear locker to work with factory harnesses

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'98/99 LX are pre-wired for AHC and rear lockers (male pins at right). The photo at left shows the '99 LX harness w/o locker wiring and the '99 LC harness w/o AHC. Must combine the two
 
cruiserpatch said:
I wired my Eaton front to the 80 switch without issue. The 98/99 LC models are actually wired with front locker lights in the cluster (same cluster as the 105).

98/99 LX are not wired for front lockers but everything is there for the rear.

View attachment 4112994
'99 LX with re-pinned locker switch connections
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How did you connect your front locker to the RR/FR rotary switch? Any reason not to tap in to this wire?

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TahoeZ said:
Which connector failed? The one at the pigtail at the diff?
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Yes the provided "weather sealed" connector in the Eaton kit. @ga12r1 has had similar issues with his connectors as well as other hardware issues...
 
Pulgasari said:
How did you connect your front locker to the RR/FR rotary switch? Any reason not to tap in to this wire?

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I'm fairly sure I just de-pinned that connector and inserted a new wire-end. Taped over the existing wire in case I used it or needed it for reference one day.

Tap into it. It'll work
 
And here are 2 unrelated failures that have nothing to do with harnesses. Just so you know I’ve had 4 different mechanical Eaton E-Locker failures, not to mention their bobo harnesses.🤬
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TahoeZ said:
Winning.
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Well after 6 years of issues, failures, and iffy engagement I for sure am winning. Cause I pulled both front and rear Eatons, trashed them, and installed ARBs.
Having to buy and install new lockers was a hard pill to swallow but I can say it was definitively worth it.
Now my truck is trash free. 🎉
 
TahoeZ said:
I went with Eaton this time as I had previous poor experiences with ARB. Not super impressed with the Eatons so far but no failures yet.
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You had mechanical ARB failures/breakage or seal failures? The thing about ARB that’s great is you can get replacement parts easy. No matter what fails.
Eaton doesn’t even offer a service kit or parts for the front and rear of 200, I’m not sure about the front Eaton for the 100. IMO that’s just nuts. You break a part and basically have to replace the entire unit.
 
ga12r1 said:
You had mechanical ARB failures/breakage or seal failures? The thing about ARB that’s great is you can get replacement parts easy. No matter what fails.
Eaton doesn’t even offer a service kit or parts for the front and rear of 200, I’m not sure about the front Eaton for the 100. IMO that’s just nuts. You break a part and basically have to replace the entire unit.
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Only seal failures. Probably will go back to ARB anyways though if/when these Eatons fail.
 
TahoeZ said:
Only seal failures. Probably will go back to ARB anyways though if/when these Eatons fail.
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If you don’t wheel hard and heavy you’ll probably be ok, but the simple fact is the ARB is definitely a stronger locker 👍
 
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