Network, Functions

Network, functions




Previously each function had its own Control module, for example cruise control, alarm, turn signal lamps, rear demist and so on. On the P2X a function can be split between a number of modules, each of which has a particular task within the overall function. It is also possible to introduce more logic functions without needing more cables, connections and switches.

For example instrument/control lighting
Previously the control and instrument lighting intensity has been directly controlled by the rheostat position via separate cables to each of the lights.
In the P2X the rheostat is connected to the network through the Light Switch Module (LSM) and communication takes place as follows:
- Light Switch Module (LSM) senses rheostat position and informs the Central electrical module using serial communication.
- The Central Electronic Module controls the lighting for the hazard warning signal flasher and front and rear cigarette lighter.
- The Central Electronic Module sends the information onwards as a CAN message on both high and low speed network sectors.
- The Transmission Control Module (TCM) reads the CAN message on the high speed sector and sends the message on to the Gear selector module by serial communication. The Gear selector module controls the gear lever lighting.
- The CAN message is received by the Upper Electrical Module (UEM), Drivers Door Module (DDM), Passenger Door Module (PDM), Road Traffic Information (RTI), Phone Module (PHM), Driver Information Module (DIM), Audio Module (AUM) and Climate Control Module (CCM) which all adjust the lighting intensity according to the rheostat position.

Control panel lighting
The control panel lighting is affected by the light conditions by the climate control system sun sensor senses the light sensitivity, which affects the climate control system setting.
Information about the light intensity is converted in the climate control system module to a CAN message which is sent out on the network and received by the other modules. The control panel lighting is adjusted depending on the light intensity, so that it is stronger in daylight and weaker when it is dark.