How many miles on the car? Did the light came on intermittently ? Also look for corrosion and cracked power cables.
The brushes are inside the regulator, so the regulator can be replaced (don't use chinese ones). Careful when ordering, about 2005 and up have a different regulator. Some aftermarket ones came with awful female torx screws but most have standard philips screws only these get stuck in there so easy to round - put force and go very slowly with the screw driver.
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