No Bus Indicator

The no-bus indicator gives an indication to the vehicle operator when the electronic communication data bus is ineffective. This indicator is controlled by the IPC logic circuit based upon IPC programming and electronic messages not being received over the CAN data bus.

The no-bus indicator function of the odometer VFD unit is completely controlled by the IPC logic circuit. This logic only allows the indicator to operate when the IPC receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the odometer VFD no-bus indicator is always off when the ignition switch is in any position except ON or START. The IPC turns ON the no bus indicator for the following reasons:

• No Electronic Communication Messages  - Each time the ignition switch is turned to the ON position and the IPC does not receive electronic communication messages over the CAN data bus, the no-bus indicator illuminates. The indicator remains illuminated until CAN bus communication is restored or until the ignition switch turns to the OFF position, whichever occurs first.

The IPC continually monitors the CAN data bus to determine the status of many sensors and systems throughout the vehicle. If bus communication is interrupted, the IPC cannot provide accurate displays and outputs.