Normal Operation
WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
When the ignition switch is turned to the ON or START position, the instrument cluster illuminates the yellow anti-lock brake system (ABS) warning indicator. Once the ABS module has performed a self-check, a message is sent along the CAN bus to the instrument cluster to turn the indicator off. When the ABS module detects a fault in the ABS system, a message is sent to the instrument cluster to illuminate the indicator.