System Overview: Signals
The table below summarizes the input signals to and output signals from the accessory electronic module (AEM) (4/78).
The signal types are divided into directly connected signals and Controller area network (CAN) communication. The illustration below displays the same information with the Volvo component designations.
NOTE:
The signals are only available for installed accessories.
| Input signals |
Output signals |
Directly connected:
- The telemute signal from after market hands free unit to the carphone to mute the volume on the sound system.
|
Directly connected:
- Start for the parking heater consisting of +12 V to the relay for the electrical parking heater
- External alarm unit (status signals).
|
| Via Controller Area Network (CAN) communication: |
Via Controller Area Network (CAN) communication: |
Central electronic module (CEM)
(4/56):
- Start and stop signal, to control the relay for the electrical parking heater
- Alarm status, door status, key status. Used by the accessory electronic module (AEM) to control the external alarm.
Steering wheel module (SWM)
(3/254):
- Manual start and stop signal, to control the relay for the electrical parking heater. Via central electronic module (CEM).
|
Infotainment control module (ICM)
(16/1):
- Telemute signal via infotainment control module (ICM) via the MOST network to the audio module (AUD).
Central electronic module (CEM)
(4/56):
- Start and stop signal, to control the relay for the electrical parking heater
- Start and stop signal, to control the combustion preheater module (CPM) (for fuel driven parking heaters).
|
Courtesy of VOLVO CARS CORPORATION