System Overview

System overview

Control module

Location Of Components:

The function of the accessory electronic module (AEM) is to allow certain accessories to exchange information with the controller area network (CAN) of the vehicle. The control module functions as an interface between accessories, which are not prepared for Controller area network (CAN) communication, and the Control area network (CAN) of the vehicle and its functions. This exchange of information means that accessories can be installed with greater functionality and higher quality.
The accessory electronic module (AEM) manages the following functions:
- relay for the electrical engine block heater
- outputs for external after-market alarms
- tele-mute for non-integrated car phones.
The functions managed by the accessory electronic module (AEM) may vary between different car models.
The accessory electronic module (AEM) is an accessory and is only available for order and installation as an after market item.
Adapter wiring is required when installing accessory electronic module (AEM).
The control module is installed in the cargo compartment of the vehicles behind the side panel at the right-hand wheel arch.
After installation the accessory electronic module (AEM) is configured using software. Configuration is carried out via VIDA.
The control module communicates with directly connected components, and via a Controller area network (CAN).
The control module checks activations and input and output signals via an integrated diagnostic system. A diagnostic trouble code (DTC) is stored if the control module detects a fault. Any diagnostic trouble codes (DTCs) and stored in the control module memory and information can be read out using VIDA.
For further information, also see Signal specifications.

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.