1998 Volve S70. The abs light and the tracs off light stay on all the time. any idea why? the drivers seat automatic button will move the seat backward but not forward. All the memory buttons work and it will move forward in memory only. All other driver seat buttons work except to move forward. Any ideas?

ABS and TRAC light on is usually a bad wheel speed sensor. Fix the brake line first tho

Any time the ABS light is on the traction control light will be on and the system will be disabled.

The ABS light is on because the ABS computer has detected a fault either in its self check if the light comes on at start up and stays on or when the vehicle is moving, the light will come on at start up then turn off and then come back on after the vehicle is moving.

The best advice I can give is have the ABS computer scanned for codes. This will give a good direction to head into to solve the problem. A high end muti-function scan tool or a ABS specific code reader will be needed to do this.

Once you know the code(s) post them and I'll be happy to help you further.

Some common problems I see on the minivans are rear speed sensors and broken exciter rings. The exciter rings will cause the light to come on after you start moving and can also have some other symptoms like overactive ABS and not turn on the light as well.

A bad speed sensor can cause the light to come on and stay on. There is a way to check them but you will need a good DVOM and know how to use it.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

This is probably a fault with the ABS control unit. Is your ABS light on?

MOST OF THE TIME WHEN ABS LIGHT AND TRAC LIGHT TURNS ON.YOU COULD HAVE A BAD WHEEL SPEED SENSOR.BEST TO TAKE CAR TO DEALERSHIP LET THEM DO CODE SCAN ON ABS BRAKE SYSTEM TO SEE WHAT CAUSING THE ABS AND TRAC LIGHT TO TURN ON.

The tracs off light comes on automatically whenever the ABS light goes off. Each of 4 wheels has an ABS sensor. The ABS light usually comes when any one of these sensors go bad. It could also be the ABS computer but the computers usually last the lifetime of the car on Volvos. Then, of course it could be some wire spliced somewhere in the ABS circuit and that would be something very difficult to find where the short is. But try the sensors, they are usually the culprit.

sounds like maybe you have a bad wheel abs sensor on one of the wheel take it to auto zone and get a code tell me what code says like the name of item not functioning but id bet it is the abs sensor is failing and messes up traction control

99% Bad ABS Module.

Unless you have a cut ABS wheel sensor.
I fix them my self.

[email protected]

Usually those are symptoms of the ABS Controller going bad. The lights will be intermittent for a while and eventually stay on all the time. You can contact this guy for a rebuild, http://home.earthlink.net/~vicrocha/

This generally means that you have a problem with your brake system. I would try opening the hood and checking the brake fluid level on your Avalon.

It should come on for a few seconds with the other lights, but should not stay on for a minute.  If you get an intermittent ABS light it could be a speed sensor or more likely the ABS module.  If you get an ABS light along with a flashing arrow light, traction control light, or  speedometer and odometer goes out, then it is just about guaranteed to be an ABS module issue.  There are online sites that will rebuild ABS units for around $150 or less.  They are pretty easy to remove and install yourself with the right socket.  Google "Victor Rocha".  His site has good information on the procedure and he is well trusted for his rebuilding jobs (I have no affiliation to him or the site).