Operation

OPERATION

The auto high beams (SmartBeam(TM)) indicator gives an indication to the vehicle operator of the system status. This indicator is controlled by the instrument cluster logic circuit based upon cluster programming and electronic messages received over the Controller Area Network (CAN) data bus from the Auto High Beams (SmartBeam(TM)) Module (AHBM).

The auto high beams indicator function of the reconfigurable dot matrix Organic Light Emitting Diode (OLED) display 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 OLED auto high beam indications will always be OFF when the ignition switch is in any position except ON or START. The instrument cluster will turn ON the auto high beams indicator for the following reasons:

- Auto High Beams Status Inactive To Active Message - Each time the cluster receives an electronic auto high beams status inactive to active message from the AHBM while an auto high beams override is not active, the AUTO HIGH BEAMS ON textual message is displayed. The message is displayed for about three seconds, until the cluster arbitrator logic determines that another display request has priority, or until the ignition switch is turned to the OFF position, whichever occurs first.
- Auto High Beams Override From Inactive To Active Message - Each time the cluster receives an electronic auto high beams override from inactive to active message from the AHBM while the auto high beams status is active, the AUTO HIGH BEAMS ON textual message is displayed. The message is displayed for about three seconds, until the cluster arbitrator logic determines that another display request has priority, or until the ignition switch is turned to the OFF position, whichever occurs first.
- Auto High Beams Status Active To Inactive Message - Each time the cluster receives an electronic auto high beams status active to inactive message from the AHBM while an auto high beams override is not active, the AUTO HIGH BEAMS OFF textual message is displayed. The message is displayed for about three seconds, until the cluster arbitrator logic determines that another display request has priority, or until the ignition switch is turned to the OFF position, whichever occurs first.
- Auto High Beams Override From Active To Inactive Message - Each time the cluster receives an electronic auto high beams override from active to inactive message from the AHBM while the auto high beams status is active, the AUTO HIGH BEAMS OFF textual message is displayed. The message is displayed for about three seconds, until the cluster arbitrator logic determines that another display request has priority, or until the ignition switch is turned to the OFF position, whichever occurs first.

The AHBM continually monitors the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN) to determine the status of the auto high beams system and the status of the auto high beams override to determine the proper outputs to the Front Control Module (FCM). The AHBM then sends the proper lamp-ON or lamp-OFF message to the EMIC.

For proper diagnosis of the auto high beams system, the AHBM, the FCM, the EMIC, the CAN data bus or the electronic communication related to auto high beams indicator operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.