How do i reset my abs warning light on my 2000 pontaic montana?\

You'll need a repair book or shop manual to get the wiring diagrams and test procedures.
You would need to know if you have power going into the module and a signal from the computer.

If the warning lights go off after you start the van, it should just be a test for the lights. If the lights stay on after you are driving, you need to get the body computer scanned for trouble codes.

find your reset switch and reset it

The light resets itself when the problem that caused it to be turned on is repaired. See the dealer for diagnostics and repair.

I really need to know exactly which lights are on. If it is the change oil in the information box then you turn the ignition switch on, push the gas pedal down fully 3 times, turn the ign off. Then start the car and if it does not come on, then it has been reset. Sometimes you have to do that several times before it will reset, not sure why. I'm not sure what you mean by ABS and etc.

take it to a mechanic and have brakes and powertrain checked

you mean abs not ads stands for anti brakeing system have your checked its throwing a code have fixed then light will go off its telling you somethings wrong somewhere in your brakes

if the light is on there is codes some systems are not on the can bus network and require you too goo too that actuall computer in this case ABS module wicth also controls the traction control system and you will need a good scanner the 100 doller made in china ones wont do it take it too a shop they will probly get the info for a some fee it coul be one of the whel speed sensors or the abs module itself

The ABS light will stay on only when a problem exists. Once repairs have been completed and no problems exist the ABS light will go off on it's own. Take the car back to where you had the work done and have them fix it. It shouldn't cost you anything. If the ABS light was not "on" when you took the car to them, DO NOT let them charge you to fix it. They caused the problem. They can fix it. Good luck. Hope this is helpful.

i had the same problem on my 2000 montana, used a scanner to check for abs code and found right front sensor throwing code, checked sensor and found ok, checked harness from sensor to connection under hood and found wiring circut at the plastic clip where harness hooks to sensor was bad, replaced harness from connector to sensor and problem went away