If the abs light comes on than the fuses are good. If the abs light did not come on when you turned the key on than I would be suspicious of a fuse or relay failure.
The first thing you need to do is have the abs module scanned for codes. You local auto parts store may do this for you for free otherwise you can either spend a couple hundred dollars on an abs scan tool or pay for an abs diagnostic charge at your local auto shop.
Once you know what code or codes are causing the light to come on you will have a much better idea opt what the problem is.
To things that will help you out.
1. If the abs light comes on when you start the car and then goes out until your start to drive than it is likely you have a speed sensor that is going bad, or possible a wheel bearing that is getting sloppy and causing excessive air gap.
2. If the light comes on and never goes out than the abs system is failing it's self test. The first thing I would do is ohm check all four wheel speed sensors (1998 might only have three, one on each front wheel and one in the rear differential). If one is open or low on resistance than it is bad.
Hope that helps.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
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