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.
Alarm Signal Outputs
An after market alarm unit can be connected to the accessory electronic module (AEM). The system consists of four output signals which can be used as input signals in the external alarm system via a cable harness. The accessory electronic module (AEM) uses the existing Controller area network (CAN) to receive/forward signals for the vehicle alarm, key and door status.
When installing an after market alarm system the vehicle must be configured using new software. Configuration is carried out via VIDA (Volvo scan tool).
There are diagnostics for the alarm signal outputs.
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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.