I founds these instructions on a web site for the removal of the module i believe these are correct for the tahoe, im sure someone else will chime in with more info. but this should give you an idea of what is involved.
CAUTION
Getting under a vehicle when it is jacked up is dangerous. If the vehicle slips off the jack, you could be badly injured or killed. Never get under a vehicle when it is supported only by a jack.
1. Find a level place to raise the vehicle.
2. Set the parking brake firmly.
3. Put an automatic transmission shift lever in PARK or shift a manual transmission to FIRST or REVERSE gear.
4. For 4-wheel drive vehicles, be sure the transfer case is in a drive gear, not neutral.
5. Turn off the engine.
6. Use jack stands to support the vehicle and wheel blocks.
Kelsey Hayes EBCM
1999-2003 Kelsey Hayes (TM) ABS Module
Remove the Fuse
Disconnect the positive (red) battery terminal. Then locate and pull the ABS pump fuse located in the power distribution center under the hood. You are looking for a fuse box with large amperage fuses and some relays. Look along the fender well in the engine compartment relatively close to the battery. It is a 60 amp fuse in most instances and should be clearly labeled "ABS" in the large fuse box with other similarly oversize fuses used for other high power subsystems.
Unplug the ABS Module
Follow the steps below to avoid breaking the plastic retaining clips:
1) To disconnect the rectangular plug, insert a screwdriver under the red plastic locking clip. The EBCM will of course be under your vehicle when doing this.
2) Pry the red locking clip into the down position as shown
3) Firmly squeeze the side of the connector with your thumb as indicated while pulling at the same time.
4) The connector will release as shown. Some resistance is normal due to friction from the rubber “o-ring” seal.
Remove the Module
Most people have reported successful removal of the ABS controller without disconnection of the brake lines. However, you may have to disconnect all five (5) hydraulic lines for success if the roads are salted and the Torx T20 bolts are rusted in place. In such circumstance, it is best to remove the entire ABS assembly from the truck for easier removal of the ABS controller by drilling out the bolt heads.
There is very little room to access these four bolts under the truck in such stubborn cases. It is suggested that you disconnect the lines and remove the entire assembly. Take the assembly to a workbench or drill press to drill/grind the heads off of the bolts. If this sounds too ugly and disconnecting the five brake lines will ruin your day; you can instead remove the three hex head bolts attaching the ABS pump/manifold to the vehicle frame and CAREFULLY lower it. You must support the heavy pump assembly so you don't kink the brake lines. Then you will have room to get a small grinder or Dremel Tool to grind the heads off of the evil rusted bolts.
Be sure to order the EBCM Repair Kit to replace rusted or stripped out Torx ABS module bolts
Removal of any of the brake lines will require bleeding of the brakes upon re-installation. Your vehicle is probably overdue for a brake fluid flush anyways. Brake fluid is hygroscopic (absorbs water) and the water molecules will congregate in the lowest parts of the brake system eventually corroding critical brake components. Modern vehicles should have their brake fluid flushed on a regular basis; so you are providing your vehicle a much needed service in the process of this repair.
Seal the valve body
There are no loose parts such as washers or springs to lose and no fluids will leak when the EBCM has been removed. The six protruding valve bodies are permanently pressed into the aluminum housing and will not move or fall apart while the EBCM is removed for the repair.
You should keep the part of the manifold that the ABS controller once covered as clean as possible. Cover the area with plastic wrapping and tape or similar material. Make a dirt-proof and waterproof "cap" out of duct tape. Avoid driving your vehicle on dusty or wet roads if possible. Protect the plug ends of the cables from moisture with electrical tape as well. For those who have electronic four-wheel-drives, 4WD may not function properly until the ABS controller is put back in place and powered up. If you use duct tape, any sticky residue will have to be removed using carburetor cleaner.
