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2001 Avalon ABS Issues........I don't know where to start.

5.6K views 6 replies 5 participants last post by  Mr. G-Unit  
#1 ·
Hi everyone,
This is my first post in the Avalon forum as I recently came into ownership of a 2001 with 99,000 miles. The car was purchased new by my great aunt and uncle, who both recently passed away. The car hasn't been driven much in the past few years because there were "brake issues". The issue they had was that the ABS system was seemingly kicking in supposedly frequently when driven normally, not on snow or ice. I drove it a few years ago, and I did notice the ABS system kicking in, but seemingly under hard barking....it seemed normal but then again I only drove it around the block.
I think they also had it checked at the dealer and they couldn't find anything wrong with the ABS system, and there were no ABS lights illuminated.
Fast forward to a few months ago, their genius son-in-law took the car to Pep Boys and dropped $1,200 (of his in law's cash) on god knows what to get the car up and running. I think the folks at Pep Boys actually put new front pads on old rusty and warped rotors......good work there!
While at Pep Boys he had them check the brakes. Supposedly they said something was wrong with the ABS system and and really smart son in law declines the repair, but still attempts to solve the issue.
The SOLUTION......the folks at Pep Boys supposedly disconnected "something" to render the ABS system inoperative! Did I mention how much I like the son in law?
So now the dash is lit up like a Christmas tree with the ABS light and VSC light, and the ABS doesn't work. The car brakes fine, but now it has no ABS.
The aforementioned son in law is beyond useless and he has no idea what was disconnected. I need to determine what could have been disconnected to reactivate the system so I can accurately determine if the system is in need of repairs or not.
What are the major components that make up the ABS system? Where are they physically located on the car? Does the ABS system have any fuses or relays that could have been pulled? What about the ABS control module? Or wheel sensors? I am literally putting pieces of a puzzle together.

Thank you!
Zack

PS: Funny story, my great uncle that passed away in December couldn't stand his son in law. He frequently noted "everything that guy touches, he breaks". So at my uncle's funeral said son in law leaves the lights on in his wife's SUV. When we came out of church, of course her car was dead. The son in law tries to jump start the car while EVERYONE is waiting to go to the cemetery. Of course he screws it up and can't start the car. All I could think is that my uncle was laughing hysterically from Heaven!
 
#2 ·
ABS generally controlled from the black-box "pump" you'll see underhood, tfront toward passenger side - has buncha thin steel pipes coming out of it, then curving down.
It's a chock full of solenoids that control brake fluid pressure to each wheel, there's a feed back system from sensors at each wheel, that feed data to computer. Can't say if computer is the main, or an independent box.

Possible that they pulled the fuse, check fuses underhood - driver-side long black plastic box, and iirc, under dashboard drivers side - check manual for location and what fuse does what, if no manual, set up account at www.Toyota.com and download one - free.
Manual is somewhat generic, you might have to test the fuses with a multimeter. Fun times - Good Luck
 
#4 ·
I have no idea where ABS fuse is, never dealt with it on my long gone 2000 Avalon. However, you may not FIND a fuse labeled ABS, might be part of another circuit that feeds who knows what, and the ABS system. And again, owners manual tends to be hazy/generic, that's why mentioned you might need multimeter to check all the fuses..

Before anything else, check the wiring going to ABS pump, they might have just pulled it off the connector.
(If so, and it's been hanging for a year or three, clean it up with contact cleaner spray, might have some corrosion.)
 
#5 ·
+1 on Riick. Pulling the connector at the ABS pump is the simplest thing a "mechanic" could have done to render ABS inoperable.

If you search ebay for 2000-2004 Avalon ABS pump, and look for a listing with multiple photos, you'll see that the connector is on the side of the pump opposite where the cannister motor sticks out (at bottom, the pipes being at the top). In one listing I'm looking at, it's a long connector with 20 or more electrical contacts. It's about as long as the long side of the pipe input area.

By the way, ABS is still controversial. I prefer having it working, but brakes still work, as you say. Even here in Massachusetts, which is the California of the east where vehicle inspection is concerned, you can still get a sticker if the only issue is an ABS or VSC light on the dash.

If you don't have an owner's manual, which lists fuses and relays and shows locations, you can download one on the Toyota Owner's site. You'll need your VIN. That site can also give you the factory configuration and any service done by dealers.

Toyota Owners site
Click on "Join now," enter VIN
My Vehicle: Car original specs and service history (dealer service done)
Parts & Services: Maintenance Schedule
Resources: Manuals and Recalls
 
#6 ·
the 2001 Avalon has a flaw in the ABS computer. I had to replace mine. You’re gonna have to order the part from Toyota and you should just have them put it in because it only takes about 15 minutes to remove and replace, the part itself is about $1100. That’s why nobody could figure it out because you don’t actually have any break issues but the light is eliminated when I’m gonna tell you when the ABS computer goes out you will know what the problem is. Toyota will turn your VSC off for everything that is wrong with your computer. Let it be brakes your fuel injector being clogged up 02 sensors anything but I promise you from experience. It is the ABS computer. There is a flaw in it. Good luck.