System Overview: Signals
The table below summarizes input and output signals to and from the Differential Electronic Module (DEM). The illustration below displays the same information with the Volvo component designations.
| Input signals |
Output signals |
| Directly connected: |
Directly connected:
(power supply unless otherwise stated) |
| - |
- Electric feed pump
(internal in AOC) - pulse-width modulated (PWM) signal
|
| Via CAN communication: |
Via CAN communication: |
- Central electronic module (CEM)
(4/56) gives information on ignition position, reverse gear status, parking brake status, whether or not a trailer is hooked up, etc.
- Brake Control Module (BCM)
(4/16), informs on the speed of the wheels from the wheel speed sensors and ABS modulation status amongst other things.
- Engine Control Module (ECM)
(4/46), informs on engine speed, driver engine torque request, calculated engine torque, accelerator pedal position, brake light switch status and clutch pedal switch status, amongst other things.
- Steering wheel angle sensor module (SAS)
(4/68) gives information on the current steering angle.
|
- Brake control module (BCM)
(4/16), receives information about the status of the coupling unit and current torque capacity for the rear axle.
- Central Electronic Module (CEM)
(4/56), receives information on the diagnostic status of the Differential Electronic Module (DEM).
- Driver information module (DIM)
(5/1), via Central electronic module (CEM) receives information about malfunction messages from Differential electronic module (DEM). These are shown to the driver as text messages and warning symbols.
|
 Courtesy of VOLVO CARS CORPORATION
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