Home » Opel Astra H Alarm Active Only in Display? Here’s the Fix! The “ghost alarm” problem explained On many Opel Astra H models (2004–2010), the alarm system can be activated from the onboard display (GID or CID) — even if there’s no real alarm installed! This causes the REC (Rear Electrical Centre) to look … Continue reading Opel Astra H Alarm Active Only in Display? Here’s the Fix!