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Are you using a scanner to access the vehicle to pull code on both the OBD and the J plugs? If so, which scanners are you using? I ask because a lot of time I am only able to pull codes up with the Tech 2 Tool scanner or the JPro.
Have you done the other checks on the vehicle like checking for power and such? I'm presuming you have air brakes since this is a EC30 unit. Have you checked the wheel sensors to verify they are all pushed in?
If this is on the vehicle side, most likely the chassis module can;t see the ABS module which is what is giving the dash light. The scan tool on the chassis will be needed to see what code it has to then see if the harness needs to be chased or if there is some other issue going on. This will not be an easy task to work with. If the ABS module is getting power and isn;t coding, then that system will be working properly. It will then be in the chassis module where the code is because it can't see the ABS module. Worst case scenario is to disable the light behind the dash until the chassis module can be repaired or scanned to determine the error.
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