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). |
Scheme 29
Scheme 30
The accessory USB unit (AUU) is designed to serve as an interface between the vehicle infotainment system and external USB and iPod devices.
The accessory USB unit (AUU) has a directly connected USB port and supports the standard for removable media on USB 2.0.
The accessory USB unit (AUU) receives input signals from the infotainment control module (ICM) via the MOST network. The current status appears on the Infotainment Control Module (ICM) display.
All input and output signals from the control module travel via the MOST network.
The Accessory USB unit (AUU) is located behind the glove compartment down to the left on the cowl panel.
When replacing the control module reprogramming is required.
The control module can be diagnosed.