Again it's not looking good for the ABS unit itself.
From my recent research, I'm getting conflicting information as to when the ABS units changed.
I think the first thing you should do is go to ePer and enter your VIN number.
FIAT ePER :: The FIAT Forum
Spare Parts, Alfa Romeo and then enter your VIN in the box ( ZAR9160000nnnnnnn ).
33102 BRAKE HYDRAULIC SYSTEM
Scroll to the bottom and select image 3/8
In the parts list on the right, look at item 5 "CENTRALINA ELETTRONICA"
There are two entries -
C4051 is the early ABS unit ( 0273 004 337 ) and D4051 is the later unit ( 0273 004 495 ). The one that isn't
greyed out should be the one fitted to your car at the factory.
With that information, now survey the car.
Get under the car at the front an look at the driveshafts as they enter the hub. Between the CV joint rubber boot and the upright have a look for teeth going around the circumference of the CV as in this photo ( first post, at the right of the photo )
http://www.alfaowner.com/Forum/alfa-...t-dilemma.html (Driveshaft dilemma)
Cars with the ...337 ABS unit you should have those teeth.
Cars with the ...495 ABS unit you should NOT have those teeth.
If I were you, I'd check all 4 wheels as the car's history is unknown. Obviously the rear wheels don't have CV joints but the teeth will still be there for ...337 ABS equipped cars.
So now, hopefully, ePer and the ABS sensors will tie up ( ...337 all wheels should have teeth, ...495 no teeth ).
So now, you need to check the label on the ABS unit itself ( as above ) to check that is correct for the car.
If you have access to a multimeter, I can suggest some more tests ( to check for +12v and continuity to earth and other components ). I'd want to check that the the ABS unit is receiving power from both fuses and that it has a good earth.
Incidentally, I have now powered up a phase 2 TS instrument pack without anything else other than power connected and the ABS lights do not come on ( only the seat belt light for about 5 seconds and the airbag light ). So the ABS light(s) do not default on with a wiring or ABS fault.