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Does the light come on at random or mostly when pressing the brake hard?
Have you checked the brake fluid level yet?
Also, if you plan to diagnose/repair it yourself you may need to have the vehicle's computer scanned for ABS codes. That can be done at most reputable repair shops or at some parts stores for free.
When the light is on, a good shop should be able to pull a diagnostic code to see where the short is. There are a number of systems that will cause the ABS light to illuminate and the best way to narrow it down is with the trouble codes.
Does the light come on at random, stay on all the time, only when pressing the brake, when cold...?
The first thing I would check if the brake fluid level.
Next, I would have the vehicle scanned for codes when the light is on.
There is really no other way to diagnose this one.
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