High Beam Indicator

The high beam indicator gives an indication to the vehicle operator whenever the headlamp high beams are illuminated. This indicator is controlled by a transistor on the IPC circuit board based upon IPC programming and electronic messages received by the IPC from the BCM over the CAN data bus.

The high beam indicator LED is completely controlled by the IPC logic circuit, and that logic will allow this indicator to operate whenever the IPC receives a battery current input on the fused B(+) circuit. Therefore, the LED can be illuminated regardless of the ignition switch position. The LED only illuminates when it is provided a path to ground by the IPC transistor. The IPC will turn ON the high beam indicator for the following reasons:

• High Beam Indicator Lamp-On Message  - Each time the IPC receives an electronic high beam indicator lamp-ON  message from the BCM indicating the high beam lamps are turned ON, the high beam indicator will be illuminated. The indicator remains illuminated until the IPC receives a lamp-OFF message from the BCM, or until the exterior lamp load shedding (battery saver) timed interval expires, whichever occurs first.

The BCM continually monitors electronic exterior lighting request  messages from the IPC to determine the appropriate outputs to the headlamps. The BCM activates or deactivates the headlamp high beams then sends the proper lamp-ON or lamp-OFF message back to the IPC.