Abs Indicator

The ABS indicator gives an indication to the vehicle operator when the ABS system is faulty or inoperative. This indicator is hard wired on the instrument cluster electronic circuit board, and is completely controlled by the Controller Anti-lock Brake (CAB). The ABS indicator Light Emitting Diode (LED) receives battery current on the instrument cluster electronic circuit board through the fused ignition switch output (run-start) circuit whenever the ignition switch is in the ON or START positions. The LED will always be off when the ignition switch is in any position except ON or START. The LED only illuminates when it is provided a path to ground by the CAB through the CAB relay in the PDC. The CAB continually monitors the ABS circuits and sensors to decide whether the system is in good operating condition. The indicator is turned on by the CAB for about 2 seconds after the ignition switch is turned to the ON position as a bulb test. After the bulb, the CAB turns the indicator on or off based upon the results of the ABS self-tests. If the CAB turns the indicator on after the bulb test, it indicates that the CAB has detected a system malfunction and/or that the ABS system has become inoperative.