I installed a front wheel bearing kit in my 2003 GMC now the ABS WARNING SIGNAL COMES ON AND STAYS ON

You need to find someone with a scanner like autozone,carquest etc; that will scan the code for free, chances are the wheel bearing the person put in has a bad wheel speed voltage output, this is comon in cheaper repladement wheel bearings, try to stick with Gaylord WBI bearing/hub assy, they seem to be the best for your money. a Scanner can run code and unfortunately no you can't unhook battery to clear it, and as far as connector at wheel it is a 2 wire connector and should have a lock tab you hold out with a small screwdriver while pulling apart...Hope this helps you

check make sure you reconnect the wheel speed sensor built in the wheel bearing assembly make sure you reconnect wheel speed sensor connector or look make sure no wires and connector wont damaged.

Hello
Whenever the ABS warning light comes on in the instrument cluster and it stays on it means the systems electronic control module (computer) has detected a problem in one or more of the inputs to the module, an ABS fault code is present as long as the ABS light is on. So what must be done to correct this? You must have the ABS electronic control module scanned with a special tool to read the fault code, then a trained technicain will diagnose and repair the defective part or wiring. Most times this is a wheel speed sensor (one for each wheel) that gives an erratic signal. While the light is on all you have is regular non-ABS brakes.

Absolutely YES! The bearing and hub assembly contains the wheel speed sensor which is used by the Antilock Brake System (ABS) and the Traction Control (TC) system to see when a wheel is trying to lock up and cause skidding. The ABS will release the hydraulic pressure to the brake on that wheel and the traction control will reduce engine speed to prevent the wheel from locking up or causing you to spin out.
Many GM vehicles also commonly have problems with the wiring harnesses to the wheel speed sensors that can cause this same problem. The computer does not know WHY it cannot read the speed sensor signal. It only knows that it is not getting the signal and this is why the light is turned on. Before paying the BIG BUCKS for a wheel bearing and hub assembly, it would be wise to make absolutely certain that the problem is not being caused by a fault in the wiring harness. I have seen many mechanics automatically replace the wheel bearing only to find out that the problem still exists because they did not take the time to DIAGNOSE the problem. The fault code description says "Wheel Speed Sensor CIRCUIT fault." They see "speed sensor and automatically replace the sensor without actually checking the circuit. Not a problem unless you are the customer having to PAY for this type of guess-work!!!

There are wiring harness repair kits available for MOST GM vehicles just for this purpose.

I have included pictures of the bearing and hub assembly and the wiring harness kit to help you understand what we are talking about here.

Note the electrical connector sticking out of the hub assembly. This is the wires to the speed sensor. In the other picture, the connector at the end of the wiring harness is what plugs into the connector in the hub assembly. The other end of it gets spliced into the main vehicle harness in the engine compartment, after cutting the original harness out.

WHEEL BEARING AND HUB ASSEMBLY



WIRING HARNESS REPAIR KIT

This is a common issue, and is pretty easy to fix. There are ABS sensors on the wheels, and you have a bad one. Usually the wires become corroded, and are easy to spot. The unit is on the back side of the wheel assembly.

Removal & Installation Front To Remove:
The front wheel bearings are not serviced separately. If the front wheel bearings are defective, the hub and bearing assembly must be replaced.

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Lubricate the threads on the halfshaft with clean engine oil.
3. Remove or disconnect the following:
   • Front wheels
   • Halfshaft hub nut
   • Caliper from the steering knuckle WARNING
     DO NOT allow the brake hose to support the weight of the caliper.
     
   • Brake rotor
   • Anti-lock Brake System (ABS) sensor from the backing plate
   • Hub and bearing assembly from the backing plate
   • Hub and bearing assembly from the halfshaft
   • Hub and bearing assembly

To Install:
Exploded view of the front hub mounting and related components

1. Install or connect the following:
   • Hub and bearing assembly onto the halfshaft
   • Hub and bearing assembly to the backing plate. Torque the 3 bolts alternately and evenly to 70 ft. lbs. (95 Nm).
   • ABS sensor
   • Brake rotor
   • Caliper on the steering knuckle.
   • Halfshaft nut. Torque it to 118 ft. lbs. (160 Nm).
   • Front wheel. Torque the nuts to 100 ft. lbs. (140 Nm).

on that vehicle it,s replacement remove wheel remove brake caliper and pads remove brake caliper mount if you look on back side of spindle around area where axle comes thru you have three or four bolts remove bolts remove axle nut and hub bearing assembly comes off re-install in reverse order if this vehicle has 4 wheel abs unhook any wheel speed sensors

do not replace only the bearing. replace hub assembly. remove rim/tire , remove caliper, mounting plate, rotor. . un bolt hub assembly, unplug abs. remove front axle nut if 4x4. you may need to rent the axle nut remove kit and hub puller. pull out hub. drive axle reward out of hub. install new part. do not torque hub over 90lbs. check with parts sell for spec

It is a hub assembly, each wheel has one. If you have play, are getting a roaring noise, or have an ABS light on, these are all symptoms of a bad bearing.

take frt tire off,brake calyper and bracket,disc rotor,undo cv shaft bolt,unplug abs sensor under rubber splash guard ,undo 4bolts for hub bearing assembly from steer. knuckle.