No Fuse Indicator

The no fuse indicator gives an indication to the vehicle operator when the Ignition Off Draw (IOD) fuse is ineffective or is not installed. This indicator is controlled by the IPC logic circuit based upon IPC programming and electronic messages received over the CAN data bus from the BCM.

The no fuse indicator function of the odometer VFD unit is completely controlled by the IPC logic circuit, and that logic will only allow this 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 fuse indication will always be OFF when the ignition switch is in any position except ON or START. The IPC will turn ON the no fuse indicator for the following reasons:

• No Fuse Indicator Lamp-On Message  - Each time the ignition switch is turned to the ON position and the IPC does not receive battery voltage from the IOD fuse, a no fuse indicator lamp-ON  indicator will be illuminated. The indicator remains illuminated for about three seconds, until the IOD fuse is installed, until the trip odometer reset switch button is depressed or until the ignition switch is turned to the OFF position, whichever occurs first.

The BCM continually monitors the IOD circuit to determine the status of the IOD fuse. The BCM then sends the proper lamp-ON or lamp-OFF message to the IPC.