System Overview: Signals
The chart below summarizes the input and output signals to and from the differential electronic module. The illustration below displays the same information with the Volvo part numbers.
| Input signals | Output signals |
| Directly connected: | Directly connected: (power supply unless otherwise stated) |
| Temperature sensor | Electric feed pump |
| Stepper motor | |
| Via Control Area Network (CAN): | Via Control Area Network (CAN): |
| Central electronic module (4/56), parking brake switch status, ignition key position and back up signal | BCM (4/16), clutch status |
| BCM (4/16), wheel speed from the wheel speed sensors and status signal (to open the clutch at stability control). | |
| Engine control module (ECM) (4/46), provides information about, engine speed (RPM), torque, accelerator pedal (AP) position and the stop lamp switch status. | |