What I am telling you is the car is running the battery down b/c the alternator is not fully charging it...so, the test is to check the voltage as the car is running to see what the output of the charging system is.
A low V condition effects both ASR and ABS systems.
If you charge the battery as I recomended and the fault goes away with a fully charged battery, only to return a few days later, that indicated a low V conditon. The battery can not charge itself..so you want to know is " does the ALT put out the factory specs needed to keep the battery fully changed "..if NO, the first suspect is the Voltage Regulator b/c they wear out.
Could be new batteries in there every week until the Cows come home w/o solving the problem
Check the V output of the CHARGING SYSTEM..or have someine do it ..it takes all of 30 seconds..

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A Dalton