Module, Display Screen (DSM): Operation
The Display Screen Module (DSM) receives fused B+ from the interior Power Distribution Center (PDC) and is supplied by a ground eyelet secured to the instrument panel carrier behind the Instrument Panel Cluster (IPC). In addition, the DSM status is broadcast over the Controller Area Network - Interior High Speed (CAN-IHS) data bus to be used by the radio when the radio sends a CAN message for the status of the DSM.
The radio receives touchscreen signals via the LVDS wire harness that connects directly between the radio and DSM. The DSM communicates via a hardwired backchannel protocol with the radio over the LVDS wire harness.
The DSM provides all of the functions of the radio with integral touchscreen. Unlike a radio with integral touchscreen, the DSM is disassociated from the radio and connected by a LVDS wire harness.
The DSM receives vehicle configuration and network configuration information from the vehicle configuration management system via the CAN-IHS data bus. Any diagnostic or loss of communication states are also sent via the CAN-IHS data bus.
Hardwired Inputs
- Video data from radio
Hardwired Outputs
- LVDS backchannel touchscreen messages to radio
CAN-IHS Inputs
- Vehicle configuration from Body Control Module (BCM)
- Network configuration from BCM
- Disable diagnostics on CAN
- Disable loss of communication on CAN
- Requested display intensity from radio
- Display status
- Battery voltage from BCM
CAN-IHS Outputs
- Remote display status
- Remote display controls data