Traction Control Indicator

The traction control indicator gives an indication to the vehicle operator when the ESC/BAS/Traction Control System (TCS) has been activated. This indicator is controlled by the IC logic circuit based upon programming and electronic messages received by the IC from the CAB over the CAN data bus. The IC will illuminate the traction control indicator for about four seconds as a bulb test each time the ignition switch status transitions to ON.

The traction control indicator is completely controlled by the IC logic circuit, and that logic will only allow this indicator to operate when the IC receives a battery current input on the fused ignition output (run-start) circuit. Therefore, the indicator will always be OFF when the ignition switch status is anything except ON or START. The indicator only illuminates when it is provided a path to ground by the IC circuitry. The IC will turn ON the traction control indicator for the following reasons:

• Traction Control Indicator Lamp-On Message  - Each time the IC receives an electronic traction control indicator lamp-ON  message from the CAB indicating that the ESC/BAS/TCS has been activated, the traction control indicator will be illuminated. The indicator can be flashed ON and OFF, or illuminated solid, as dictated by the CAB message. The indicator remains illuminated solid or continues to flash until the IC receives a lamp-OFF message from the CAB, or until the ignition switch status transitions to OFF, whichever occurs first.

The CAB continually monitors the traction control switch to determine the proper outputs to the components of the Antilock Brake System (ABS). The CAB then sends the proper lamp-ON or lamp-OFF message to the IC.

For proper diagnosis of the traction control switch, the ESC/BAS/TCS, the CAB, the IC, the CAN data bus or the electronic communication related to traction control indicator operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.