1997 volvo 850 abs light and trac light on

Probably not. There are often vacant positions in fuseboxes, relay boxes and the various other locations electrical and electronic equipment is sited..

If you need to locate the ABS ECU you need to discover the official location, which could be almost anywhere - behind the dash or behind kick panels, behind the glovebox...

please see my tip at http://www.fixya.com/cars/r6003525-abs_traction_control_lights and let me know if you have questions

99% Bad ABS Module.

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

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i was driviing my '97 volvo 850glt ---it just died, i tried to start it again but it will turn over but not start any thoughts ?

There are actually two gears that you need to replace, a large one and then smaller one that rides inside it. You can purchase them both at www.fcpgroton.com These can also sometimes affect the operation of your speedometer. Do you by chance have an ABS and TRACS light on? If so the speedometer issue may be related to your ABS controller.

Two questions: Is your odometer working? If not then it's probably a broken gear by the stepper motor that Emissionwiz mentioned. Is your ABS and/or TRACS light on intermittently or constantly. If so that is a common sign your ABS control module has gone or is going bad. This usually happens before the speedometer starts acting up. Either one of these will start intermittently and finally end up with the speedometer not functioning at all, and both are pretty common failures with this model.

Check and make sure that the brake lights are working. It may be the brake light switch.There is a possibility that there are two separate issues though. You can have a bad ignition switch also.After starting the car move the key slowly towards the off position or wiggle the key and see if the abs/tracs light goes off.

check the crank position switch

I will bet money that it is the ABS/TRACS module. It is mounted under the master cylinder on the bottom of the ABS unit. These are very, very, very common failures. I have replaced hundreds of them in my career. To answer your other question, the TRACS system uses brakes. For example: in the snow, when the L or R wheel is spinning faster than the opposite, the TRACS will apply brake to the spinning wheel to slow it down to an equal speed. Hope this helps.

These two circuits are linked together and you probally need a ABS MODULE and possibly a rotor and they are pretty cheap on e-bay