ABS--- Antilock brake system. Mine's been out since ~ 130K miles or so
(IIRC) & I've replaced it w/2 used ones, which ALSO kept the light on, so
since it's not a deal-breaker for my daily-driven turbo-Teggy (w/214K miles,
mind you  :oP ), I'm choosing to say "F - IT".  ;o}

If you can't do it yourself or can't get it replaced on the cheap, the
"stealership" (as someone here once called it) will charge you out the
woo-ha for it, may close to $2K total, so since it aint CRITICAL to replace,
and you're NOT rich, then forget it.  ;o}

More info, from http://en.allexperts.com/q/Acura-Repair-803/ABS-light.htm :

" that is the antilock brakes.
most common thing on honda's ABS is the unit itself..
1 of 2 things:
-the accumlator has leaked out (the spherical piece in the assembly). this
supplies the pressure for the abs to apply the breaks.
-the unit itself leaks brake fluid. this will cause a 'run-on' code. if you
hear the pump come on after you start the car and run for an extended
period, then the light comes on, this is your problem.

either one of those will require a unit replacement. you are looking at over
a grand for the part alone. most people choose to leave it be and go
without. especially on older cars

occasionally the abs motor itself will go out, but this isnt as common.
although the needed part is the same (1 large assembly)"

&

https://techinfo.honda.com/rjanisis/pubs/om/IS9393/IS9393O00038A.pdf

Whoops--- didn't mean to imply that you were NOT rich, but IF you are not
rich..... then don't sweat it, but if you have the cash to replace it for
peace-of-mind, then get er done!!!!!!

That would be "ALB", Honda's own original acronym for ABS.

Yes.

Yes.

It's a pass-through system, where the fluid that goes to the calipers is
not the same fluid the ALB uses. That's why the ALB has its own reservoir.

The reservoir is in the engine compartment just beind the right-side shock
tower.

You need to get the trouble code that lies behind thae ALB light. For that
you need to look into the tiny access hole in a particular place and count
the blinks of the LED inside that hole.

The LED is inside a tiny round hole in the right side of the trunk trim
panel, just below the hinge, on 4-doors. It is behind a small rectangular
removable plug in the interior door panel at the bottom of the right-most
rear seatback on 2-doors.

Turn the ignition to "II", then count the blinks. There may be both long
and short, and multiple code sequences will be separated by a two-second
pause.

If it makes you feel any better, an inoperative ALB simply means the
braking system reverts to ordinary brake operation, exactly as if the car
had never had ALB installed in the first place.