Abs light no communication

Kabel Technician Hawaii Posted   Latest  
Unsolved
Braking
1994 Jeep Wrangler Sahara 4.0L (S) 5-spd (AX15)
Abs Light On With No Communication

I have a first generation of abs system on this Jeep, I have tried communicatMing with the module with no luck, I verified good battery voltage on the wake up circuit and verified good grounds to the module under the dash, but when I start the vehicle the abs module will not ground the main ABS relay, normally I would call it for a replacement module but what is holding me back is that the owner has a reman cardone module that does the exact same thing.

I would love any insights from you guys and see if I’m missing something. 

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Robert Mobile Technician
Michigan
Robert
 

Kabel, This is the old Teves setup I believe. Been many a moons since I worked on one and they were a pain at the dealer. Now I have to ask. You are attempting to communication with the ABS module thru the diagnostic connector below the dash correct? You don't communication with the ABS under the hood. Also, what happens if you manually ground the ABS relay? What is the outcome? Have you…

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Kabel Technician
Hawaii
Kabel
 

I tested the power just by voltage since the module was hooked up, the grounds I checked with a bulb. I was trying to communicate with the plug under the dash by the parking brake handle. not sure what you are asking about the CCD-+

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Kabel Technician
Hawaii
Kabel
 

When I ground the relay command the relay grounds and voltage goes to the module and the command on the pump relay, still no communication to the AbS module with both modules

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Robert Mobile Technician
Michigan
Robert
 

OK. There I believe is a blue connector you need to access to communicate with the abs module. The CCD is the best or data communication lines on how you will communicate with the module. Now a 94 is a 1st or 2nd year JTEC and shod be a Chrysler engineering as if memory serves me right. Anything up to 02 was still AMC controllers and influences as we need a cartridge with the DRB II to talk…

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Rick Technical Support Specialist
Missouri
Rick
 

Robert is correct. If our memories serve us correctly you will need to look for (I Think) a blue or black 6 way connector at the passenger kick panel or behind the glove box. If you have an old scan tool with adaptors will help.

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Kabel Technician
Hawaii
Kabel
 

Yes there is a black connector next to the hood release handle that I am using an obd1 Chrysler connector with my snapon scantool, the issue I’m having is that both abs Modules I have will not wake up or communicate.

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Robert Mobile Technician
Michigan
Robert
 

How do you know it is woke up? Have you checked the CCD lines of communication? Just think of it as a normal module. If you check powers and grounds and communication lines are good and nothing pulling the PC board to ground the you call a bad module. I don't see you doing your due diligence here.

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Kabel Technician
Hawaii
Kabel
 

Thank you, I didn’t think of checking the data lines. I was not sure what you were talking about when you said CCD. thanks for your help, I’ll check that and go from there.

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Robert Technician
Michigan
Robert
 

The last Dodge B van I did went right out the door with ABS light still on but 4 fresh brakes and no one even cared about a 30 yr old ABS light

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Kabel Technician
Hawaii
Kabel
 

I understand, but this customer wants the abs to work and so I am trying to figure out if I’m missing something on The electronic side that would be waking up the module.

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Agree
Robert Technician
Michigan
Robert
   

I understand 100% being a Jeeper myself ; I shouldnt of posted that and I would also have to some OBD1 Chrysler ABS reseach as well Chrysler was bad enough in 2000 inop ABS. Bonus would be the scanners are much better now if you can get a Solus on it ?

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