Non Responsive ABS module?

[SinnSix]

Hello!
1996 2 Door 4x4 Tahoe 5.7 300k Miles
Dash ABS light illuminated upon Key on and never cycles off.

I am unable to retrieve codes because my Scan tool is not seeing my ABS Module. I have used 2 different tools so far. Innova 3100 ABS and yesterday the Autel MX808. Neither can see the ABS module. I recently replaced the EBCM (brain only) with another unit that was "Known" good and have the same issue. (not 100% sure its a good unit any more).

Google search shows the same issue across many forums. I cannot find a solution as each post seems to die after the scan tool is blamed. I tested 2 other vehicles of the same vintage and both tools work appropriately.

I have checked grounds, continuity and power through all of the harnesses, and fuses under hood. I am stumped.

I watched the video below and it is INCREDIBLY informative, I am running one more continuity test this weekend if I have time. Does anyone else have this issue with their ABS being non responsive?

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[SUBURBAN5]

I'm no help but download the Manuel's on this forum and follow the wiring. Imo the light is on due to loss communication which explains why the scanners won't connect. I could be wrong but I would start there

 

[SinnSix]

I'm no help but download the Manuel's on this forum and follow the wiring. Imo the light is on due to loss communication which explains why the scanners won't connect. I could be wrong but I would start there

That's what I am feeling as well. I need to test the Serial data wires to see if they have continuity. Thanks!

 

[GoToGuy]

In the manual ABS section it goes into detail. As for the diagnostic tools, you either have a GM tech 2 that communicates with all modules or a higher end scanner that has the ability to access ABS controls. Not all low level scanners or even mid range scanners have ABS or TPMS ability.

 

[SUBURBAN5]

In the manual ABS section it goes into detail. As for the diagnostic tools, you either have a GM tech 2 that communicates with all modules or a higher end scanner that has the ability to access ABS controls. Not all low level scanners or even mid range scanners have ABS or TPMS ability.

I have the mx 808 and can confirm it communicates with the kelsey hayes abs module. At least on my 98

 

[SinnSix]

In the manual ABS section it goes into detail. As for the diagnostic tools, you either have a GM tech 2 that communicates with all modules or a higher end scanner that has the ability to access ABS controls. Not all low level scanners or even mid range scanners have ABS or TPMS ability.

I bought an Autel Mx808. So far it is the best OBD tool I have used for the price. Bi directional controls all the way up to current. I'm not sponsored nor supported by them, but AESwave in Fresno, CA gave me a good deal and they have great support for their tools. I will link the tool website for details on the tool, I don't know if the rules allow for posting links but if you want to use AESwave, just google them.

MaxiCheck MX808 | Autel

www.autel.com

I also printed the section for diagnosing the wiring and will be doing that this weekend.

 

[Schurkey]

Perhaps a moderator will move this thread out of "Engines" and into the Axles + Brakes forum.

 

[SinnSix]

Perhaps a moderator will move this thread out of "Engines" and into the Axles + Brakes forum.

Sorry, I didn't look close enough at the threads. My apologies.

 

[Tonyz28]

Did you

Sorry, I didn't look close enough at the threads. My apologies.

did you ever figure this out ? Having this issue and stumped on how to trouble shoot