Many times you will have an AWD fault due to an ABS system fault, like a wheel sensor,ect.
The only way to diagnose is to have a professional scan done on the ABS and AWD modules. The parts store computers cannot access these models. Usually a "good" independent or the dealer will have a Tech2 computer to diagnose this for you.
There are just too many things that is may be, but I would say by far its a Brake system fault causing the light.
the antilock light is on, it came up as lf and left rear wheel sensors. I had both hubs changed and it is still coming up lf sensor is bad. Could it be the wiring, and i have excess to a modis scan tool, will that do it???
ok, that would help greatly. I have seen many problems with the connectors corroding at the hub. And some wiring problems as well.
If you can get me some codes, I can narrow it down for you some.
Here is the bulletin I was after as I copied below. Now since you have replaced the effected hub already with the condition still present, Or I assume the condition is still active? It takes a special scanner to erase ABS codes. If the condition is still current I want you to purchase a connector pigtail for that hub which is the drivers front, and replace that connector with the wire kit available through Acdelco.
That should fix your problem>
Bulletin No.: 03-05-25-004A
Date: April 14, 2004
Subject:ABS and/or Traction Control Lamp On, AWD Disabled Message Displayed, DTCs Set (Replace Front Wheel Bearing and Hub Assembly)
Models:2002-2004 Buick Rendezvous2002-2004 Chevrolet Venture2002-2004 Oldsmobile Silhouette2002-2004 Pontiac Aztek, Montana
with All Wheel Drive
This bulletin is being revised to change part number information and update the model years. Please discard Corporate Bulletin Number 03-05-25-004 (Section OS - Brakes).
Some customers may comment that the ABS and/or traction control system lamp is illuminated. Also, the AWD disabled message may be displayed. Upon investigation, the technician may find several DTCs set.
When normal diagnosis leads to the wheel speed sensor as the suspect component, replace the front wheel bearing and hub assembly, P/N 89047684. Refer to the Wheel Bearing/Hub Replacement procedure in the Front Suspension sub-section of the Service Manual. This new part has 6 mm (0.236 in) added to the harness to prevent any stress to the wiring.
Parts are currently available from GMSPO.
Ive tried to erase the codes and on the data stream the lf wheel bearing is still reading zero while the other three are doing the job there supposed to. I am going to see if i may have damages the sensor when i put it is>
yes "0" is not good. Check connection real good, if good we will need to check your new speed sensor to see if it works.