Networked Dimmable Illumination

The dimming level of networked modules is determined by the IPC. Based on the ambient light level and dimmer switch position messages from the BCM, the IPC calculates the correct dimming level and sends the illumination dimming level message to the BCM and the HVAC module on the MS-CAN and the APIM, FCIM and FCDIM on the I-CAN. The BCM also forwards the illumination dimming message from the IPC to the DDM and PDM.

The receiving modules use the illumination dimming level message to determine the backlighting intensity of internal or external hardwired illumination sources. If a module does not receive the illumination dimming level message or the data received is deemed invalid, the module sets a DTC in continuous memory and defaults to full night time intensity.