For the proper diagnostic procedure for either the entire ABS system or a single component of the system, a scan tool (DRB or equivalent) is necessary. Because of the complexity of the ABS system and the importance of correct system functioning, it is a good idea to have a qualified automotive mechanic test the system if any problems have been detected.
If the Antilock Braking System (ABS) is OK, the ABS malfunction indicator lamp (MIL) will go off after two seconds upon turning the ignition switch to the ON position. The ABS lamp may illuminate a second time and then go off again. This is also normal.
The ABS lamp may illuminate under the below conditions.
The ABS lamp may or may not stay illuminated continuously if a fault is detected. It depends which Diagnostic Trouble Code (DTC) was detected and if the system corrected the problem or not. The ABS lamp may go off only after the problem is corrected and the vehicle has been restarted and driven a few miles. Remember it depends on which code was thrown and the duration that the code was detected.
This system can perform an initial diagnosis and a regular diagnosis. The initial diagnosis is performed right after the engine is started and continues until the ABS lamp goes out. The regular diagnosis is performed right after the initial diagnosis and continues until the ignition switch is turned OFF .