2001 Sienna ABS seems to engage even in bone dry weather. I can hear it activiate. The the ABS light comes on. Then it goes away. Breaks work fine. What is the problem and how much to repair it?

sounds like a bad wire either in the sensor cable or on a connector wifes van did some funky things and it was a bad sensor, also check to be sure there is no corasion on at the connector,

My Buick had an ABS problem and since I had new brakes installed my mechanic disconnected the wiring. You still have full brakes and they will work fine but the ABS part won't work. Since i did not want to spend a lot of money I drove it that way for about three years. ABS is just an addition to help but not all cars have it.

If you have no ABS light on in dash the condition is normal

some times its just dirt on the sensor try jet washing the wheels if not its a trip to the garage breaks will still work fine even if abs goes

Remove the ABS Fuse- that will kill the pump motor

You will have regular use of brakes

Don't need abs on any car anyway

weather it is dry or slippery out. you still hear the pulsating of the abs brakes. this is normal.

well it looks like theres a problem in your break system somewhere could be the calipers mabey one is sticking or it could be dragging and its a warning i always thought that if the abs comes on then that means your vehicle is performing a duty in order to keep the breaks from locking up due to something malfunctioning.

For some reason the ABS module believes one of your four tires is locked up and skidding.
Do you have any warning lights that are coming on? I would suggest you take the vehicle to your local Auto Zone or Advance Auto Parts and ask them to scan the vehicle for trouble codes. Write the codes down and respond back to this reply and we can get started diagnosing.
Chances are you have a wheel speed sensor that is registering "0" mph when the brake is applied, that is usually the most common problem with your type of ABS activation.
Good luck, let me know when you have the codes.
Regards,

ABS pump may be faulty. Quite common, that is the exact reason I always remove the fuse under the hood for all my ABS. on all cars. I don't trust them.

Your car, like mine, has suffered the usual ABS pump electronics failure.

I have an almost identical car.

There are some great threads on the net on repairing them, however the wires inside it are just shockingly small, hair sized, and not a job for even the best "DIY" solderer.

Replace the electronics module on the side of the ABS pump, it doesn't need the brake pipes loosening or anything. It is easy to swap.

Then your ABS will work as it should.

You will NEED to find a used unit, or have yours repaired though, new ones are rediculously expensive.

Great Car though.