ABS Bleed Harness?

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.

J

JerEazy

Joined
Oct 9, 2025
Threads
11
Messages
61
Location
Bradenton, FL
1997 LC

So it doesn’t look like we can activate the ABS through an OBD II 2 way scanner.

I’ve found the photo about grounding 4 pins and 12v to 2. But doing that with spare wire and connectors is not working well for me. Is there a harness that has the 2 plugs and wires? Or does anyone have any tips that I may be missing? It seems right as I’m getting the 4th ground wire in one of them pulls out. Or after the grounds are in the + pull out.

And I don’t want to fry anything putting strait voltage in there.
 
Good idea - I'd be interested in a harness built specifically to assist with activating ABS for brake bleeding that would make it idiot-proof. Something that would clamp to the battery and has a trigger to activate.
 
I'm needing clarification here so bare with me. When I use the Techstream on my '03 4runner to bleed the brakes, the software activates the ABS pump, and then engages/disengages the appropriate ABS solenoid for that specific corner. Are you wanting to do all this with a harness? Or are you referring to only activating the ABS pump and then open up the bleed nipples at each corner for bleeding the brakes? If the latter, just put +12vdc straight from the battery to the pump motor. Did you see how big the ABS fuse is? It's 60 freaking amps. Why are we thinking the voltage needs to be reduced ?

Capture.webp
 
alia176 said:
I'm needing clarification here so bare with me. When I use the Techstream on my '03 4runner to bleed the brakes, the software activates the ABS pump, and then engages/disengages the appropriate ABS solenoid for that specific corner. Are you wanting to do all this with a harness? Or are you referring to only activating the ABS pump and then open up the bleed nipples at each corner for bleeding the brakes? If the latter, just put +12vdc straight from the battery to the pump motor. Did you see how big the ABS fuse is? It's 60 freaking amps. Why are we thinking the voltage needs to be reduced ?

View attachment 4016834
Click to expand...
The fuse yes - but (from experience watching a buddy do it) if you cross a ground and positive connection between the harness and the battery, something (not the fuse) burns out. I believe it was the control module? Neat puff of black and brownish smoke.

I don’t have a tech stream - but do have a 2 way OBD II and was told by them (and read elsewhere) that the Land Cruiser doesn’t have that function through the OBD II. It must be manually activated.

IMG_2561.webp
 
Last edited:
Yes Truth - that’s what I was thinking. Electrical tends to elude me. But with the male 6 and 4 pin it should be fairly easy to put together.
 
Techstream won't work on the 80s to do what you want; you need the unobtainum "Toyota tester".

FWIW, I've had this harness (pigtail set, really) on my to do list for a while now. I'm rebuilding an ABS pump to test a theory, so I have to make one for myself. LMK who wants one and I'll try to get a price together.

It will not be the jumper box that Toyota had made for the dealerships, it'll just be the connector housings and a pigtail to connect to a 12VDC source. If there's a mountain of interest, I may whip up a switch box, but that's not in the plan as of now.
 
JerEazy said:
The fuse yes - but (from experience watching a buddy do it) if you cross a ground and positive connection between the harness and the battery, something (not the fuse) burns out. I believe it was the control module? Neat puff of black and brownish smoke.

I don’t have a tech stream - but do have a 2 way OBD II and was told by them (and read elsewhere) that the Land Cruiser doesn’t have that function through the OBD II. It must be manually activated.

View attachment 4016863
Click to expand...
AFAIK, the ABS ECU doesn't talk to the engine ECU, which is what the OBDII connector (DLC3) is connected to, so there's no way for an OBDII reader to manipulate the ABS pump. It is connected to the DLC1 connector (on the firewall) which is how you clear the codes.
1761258045409.webp


This is from the '95 EWD; nothing I see leads me to believe there's any connection to the engine ECU.
 
Malleus said:
Techstream won't work on the 80s to do what you want; you need the unobtainum "Toyota tester".

FWIW, I've had this harness (pigtail set, really) on my to do list for a while now. I'm rebuilding an ABS pump to test a theory, so I have to make one for myself. LMK who wants one and I'll try to get a price together.

It will not be the jumper box that Toyota had made for the dealerships, it'll just be the connector housings and a pigtail to connect to a 12VDC source. If there's a mountain of interest, I may whip up a switch box, but that's not in the plan as of now.
Click to expand...
Absolutely would love a that harness. And I doubt I’m the only one.
 
Malleus said:
AFAIK, the ABS ECU doesn't talk to the engine ECU, which is what the OBDII connector (DLC3) is connected to, so there's no way for an OBDII reader to manipulate the ABS pump. It is connected to the DLC1 connector (on the firewall) which is how you clear the codes.
View attachment 4016877

This is from the '95 EWD; nothing I see leads me to believe there's any connection to the engine ECU.
Click to expand...
So is there a way to cycle it from the DLC? Or that’s where the illusive magic box would be needed?

I’m not sure how using the female side activated the ABS pump when the male side is what goes into the ABS pump from what I see. But I haven’t really delved that far in.
 
Last edited:
The magic box is just a switching control; it's a generic set of switches, inside a handy–dandy cover. There is an overlay that allows you to select the appropriate switch combination, after it's connected to the pump. It does the same thing as the earlier posted image of the terminal jumpers.
This is easier (for me):
1761263979938.webp

1761264001671.webp


The sub–harnesses have the box's mating connector housings on one end and the ABS pump's mating connector housings on the other. Using the correct overlay and pigtails for the job, it'll do for a number of models. Not really needed if you're only working on one truck, or even one model of truck.
 
JerEazy said:
Absolutely would love a that harness. And I doubt I’m the only one.
Click to expand...
You're on the list. I'll let you know when I get a parts list together so you'll know ahead of time what it'll cost.
 
Malleus said:
The magic box is just a switching control; it's a generic set of switches, inside a handy–dandy cover. There is an overlay that allows you to select the appropriate switch combination, after it's connected to the pump. It does the same thing as the earlier posted image of the terminal jumpers.
This is easier (for me):
View attachment 4016925
View attachment 4016927

The sub–harnesses have the box's mating connector housings on one end and the ABS pump's mating connector housings on the other. Using the correct overlay and pigtails for the job, it'll do for a number of models. Not really needed if you're only working on one truck, or even one model of truck.
Click to expand...
It looks like there are 3 checker models 00150, 00200, 00210

Are they all the same? Or different connectors for different years? I’ll find one and turn it into a community component tool. But need it to fit my ‘97
 
Malleus said:
Techstream won't work on the 80s to do what you want; you need the unobtainum "Toyota tester".

FWIW, I've had this harness (pigtail set, really) on my to do list for a while now. I'm rebuilding an ABS pump to test a theory, so I have to make one for myself. LMK who wants one and I'll try to get a price together.

It will not be the jumper box that Toyota had made for the dealerships, it'll just be the connector housings and a pigtail to connect to a 12VDC source. If there's a mountain of interest, I may whip up a switch box, but that's not in the plan as of now.
Click to expand...
I'm in.
 
JerEazy said:
It looks like there are 3 checker models 00150, 00200, 00210

Are they all the same? Or different connectors for different years? I’ll find one and turn it into a community component tool. But need it to fit my ‘97
Click to expand...
I think those are overlays for the switching box. AFAIK, there's only one of them.
 
Malleus said:
I think those are overlays for the switching box. AFAIK, there's only one of them.
Click to expand...
Yes - just caught that diving a bit further in. Any idea which harness we need? I found one with the 00150 - but I’ve also found some other harnesses out there.
 
No clue; that's why I was going to make mine. After searching for hours, I found nothing definitive.

Again, if you're only working on one truck, or model, you don't need the switch box or the overlay. You only need the pigtail. And, after 1997 (maybe, but for sure 2002), you can use Techstream.
 
I built my own, it’s a 93 so obd1

Using this info
RedTacoma

Thread 'Is there a way to trigger ABS actuator to combat spongy breakes?'

Truck info: 1994 LC with ABS
So after some brake work (Caliper replacement with pads) I had spongy brakes. Wasted good amount of brake fluid trying to bleed them. I suspected that Air was trapped in ABS actuator but short of buying the SST tool or driving on Ice I did not see a way to trigger ABS.
While doing my front axle rebuild I installed my ABS sensor incorrectly which had resulted in ABS kicking in while descending steep grade. That had fixed sponge brakes immediately.

My question is how I can cycle actuator with out driving and with out SST tool?

Toyota lists 3 pieces for sst...
  • Like
 
You must log in or register to reply here.

Share this page

Back
Top Bottom