M52 ABS light constantly on

Hi Guys,



My ABS light is on all the time.

It started with only being on while car was moving, never on ignition or idle, but now it's on all the time.

Have tried disconnecting all 4 wheel sensors, and plugging in one by one to see if the light should go off, have read that should prove which/if any sensor is bad, light was on all the time.

Swapped the ABS relays with spare ones, no result.

Also disconnected my battery for a few hours, with no good result.

Scanned the car with INPA and Peake Tool, doesn't give me any codes.

Am I looking at a typical ABS module problem or something else, what else can I do to troubleshoot this, without investing a bunch of money on it?



Thanks alot,



Mario

M52 ABS light constantly on