Normal Operation

The anti-lock brake system (ABS) module sends a reference voltage to the traction control switch along circuit 959 (GY) to the traction control switch. When the switch is pressed, the reference voltage continues through the switch to ground along circuit 57 (BK). The ABS module then disables the traction control system when it detects this change in reference voltage and sends a message to the instrument cluster along the CAN bus to illuminate the indicator. After receiving the ABS module message, the instrument cluster sends a message to the lighting control module (LCM) to illuminate the indicator and the LCM supplies voltage to circuit 939 (PK) which illuminates the indicator.