The Rear Wheel ABS system on your vehicle performs a 4 second bulb check
when ignition voltage is applied to the system. If the bulb is not turning
on, either the bulb is burned out or the ABS unit is disconnected. The
warning lamp is self-biased so that if the module is connected to the
harness, but not operational, the lamp will turn on and stay on. The ABS
system fuse is in the high power fuse/relay box in the engine compartment.
I'm not sure of the exact location for your particular truck. However,
from the symptoms you're describing I would tend to think it is not the
fuse. Also note that this ABS system produces very little vibration when
it is active compared to a four wheel system since it cannot pump brake
fluid back into the master cylinder.
Loydt ... mine does the same thing on a 96 Rodeo, although they're NOT on 100%
time. I believe it has something to do with heat (as in air temperature) as it
much more ofen in the summertime than in the wintertime. To my VERY limited
there's a "black box" of some sort or other mounted underneath the front right
is the "brains" for the ABS system, and I'm guessing the source of the problem
is in that
black box, but I haven't investigated any further than that.
Good luck looking into it, and if you *do* find something, I for one would
hearing from you as to what you came up with.
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