Network Message Chart
Module Network Input Messages - FCIM, DDM, PDM, IPC, ACM, APIM, FCDIM
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Illumination Dimming Level | BCM | Used to command the illumination dimming level for networked modules and outputs that are hardwired to networked modules. |
Networked Illumination Operation
The system-wide illumination dimming level is determined by the BCM. Based on the ambient light level input from the autolamp/sunload sensor and the requested illumination dimming level input from the dimmer switch, the BCM calculates the correct dimming level. The BCM sends the illumination dimming level message to the GWM on High Speed Controller Area Network 1 (HS-CAN 1). The GWM then distributes the message to the FCIM, DDM and PDM on the Medium Speed Controller Area Network (MS-CAN) and the IPC, ACM, APIM and FCDIM on the High Speed Controller Area Network 3 (HS-CAN 3). The DDM and PDM send the illumination dimming level data to the Driver Rear Door Module (DRDM) and Passenger Rear Door Module (PRDM) via LIN circuits.
The receiving modules use the illumination dimming level message to determine the backlighting intensity of internal and external harwired 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 nighttime intensity.
System Diagram - Non-Networked Illumination
Non-