Electronic Stability Program OFF Indicator

Electronic Stability Program OFF Indicator

The electronic stability program OFF indicator is serviced as a unit with the odometer vacuum fluorescent display unit in the instrument cluster.

The ESP OFF indicator gives an indication to the vehicle operator that the ESP system has been manually disabled. This indicator is controlled by a transistor on the instrument cluster circuit board based upon cluster programming and electronic messages received by the cluster from the controller anti-lock brake and the transmission control module over the CAN data bus.

The ESP OFF indicator function of the odometer VFD unit is completely controlled by the instrument cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the VFD ESP OFF indication will always be OFF when the ignition switch is in any position except ON or START. The instrument cluster will turn ON the ESP OFF indicator for the following reasons:

• ESP OFF Indicator Lamp On Message - Each time the cluster receives an electronic ESP OFF indicator lamp ON message from the CAB indicating that the ESP system has been manually disabled by depressing the ESP OFF switch button in the instrument panel switch pod, the ESP OFF indicator will be illuminated. The indicator remains illuminated until the cluster receives a lamp OFF message from the CAB, or until the ignition switch is turned to the OFF position, whichever occurs first.

The electromechanical instrument cluster continually monitors the status of the ESP OFF switch over a local interface network data bus circuit to determine the requested operating mode for the ESP system. The EMIC then sends an electronic ESP OFF switch status message to the CAB over the CAN data bus. The CAB then sends the proper lamp ON or lamp OFF message back to the EMIC, confirming the current operating mode of the ESP system.

A diagnostic scan tool is required for proper diagnosis of the ESP system, the CAB, the TCM, the EMIC, the LIN data bus, the CAN data bus or the electronic communication related to ESP OFF indicator operation. Refer to the appropriate diagnostic information.