Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Control Module
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 carphones.
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 (Volvo scan tool).
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 (Volvo scan tool).
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.