The ABS light comes on when the ABS module
detects a fault in the ABS system. There are dozens of component
failures and open/shorts in wiring that will set the ABS light, ranging
from a faulty wheel speed sensor, open/short in wheel speed sensor
wiring harness, faulty hydraulic unit, fault electronic brake control
module(EBCM), faulty tone ring,etc. There isnt a relay or reset
procedure to turn the light off- it can only be turned off by repairing
the fault responsible for turning it on, and then using the factory scan
tool to erase the fault code and reset the light.
While
it is possible the majority of the faults to be repaired at home, the
fault codes can only br retreived with a diagnostic scanner with ABS
capability. This has to be done first in order to know where the problem
is to either repair or do further diagnostics to determine if it is a
faulty part or a wiring harness issue. If the problem is in the
hyrdaulic unit, this would need to be replaced by a shop as it will
require bleeding afterwards with a diagnostic scanner.
I
would advise spending the $50-70 to have the on-board computer read for
stored ABS fault codes. Considering that most sensors cost that much
themselves, you can quickly sink much more than a diagnostic fee into
replacing parts based on "what usually goes out" guesses
Hope this helped (remember comment and rated this).
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