Answer
Mar 31, 2025 - 01:34 AM
Yes, it does. Your 2007 Aston Martin V8 Vantage has a separate horn specifically for the alarm system, and it’s independent of the main vehicle horn that you use for normal driving.
The alarm siren (sometimes called the battery-backed sounder) is located in a different spot (often tucked behind a fender liner or in the engine bay depending on market spec) and it has its own internal battery. If that battery fails or the unit itself loses connection with the alarm control module, the car will trigger a “Service Alarm” message on the dash.
It’s a known issue on these cars, especially as they age. Even though your regular horn works fine, the alarm horn is likely dead or its battery has degraded, triggering the warning.
To confirm it, you may need to know how to access it, test it, and replace the alarm siren unit if needed — and that's where this manual will come in handy. It covers the manufacturer's troubleshooting procedure, as well as the step-by-step guide to the alarm unit replacement, complete with clear images and exploded view illustrations.
