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 Instrument Panel Cluster (IPC) board based upon cluster programming and a hard wired multiplex input received by the cluster from the headlamp beam select switch circuitry of the multi-function switch on the washer/beam select switch mux circuit.

The high beam indicator Light Emitting Diode (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 Headlamps-On Input  - Each time the IPC detects a high beam headlamps-ON input from the headlamp beam select switch circuitry of the multi-function switch on the washer/beam select switch mux circuit, the headlamp high beams and the high beam indicator will be illuminated. The indicator remains illuminated until the cluster receives a high beam headlamps-OFF input from the multi-function switch, or until the exterior lamp load shedding (battery saver) timed interval expires, whichever occurs first.

The IPC continually monitors the headlamp switch and the multi-function switch to determine the proper headlamp low beam and high beam control. The IPC then sends the proper electronic low beam  and high beam lamp-ON  and lamp-OFF  messages to the Body Control Module (BCM) over the Controller Area Network (CAN) data bus and controls the high beam indicator operation accordingly. For further diagnosis of the high beam indicator or the instrument cluster circuitry that controls the indicator. Refer to DIAGNOSIS AND TESTING .