Terminal 15 Ignition Interrupted

I had a similar problem on my older Opel Astra. 'Terminal 15' refers to the switched positive power supply that's active when the ignition is on. Did you check the fuse box related to the starter solenoid or the power supply relay? A defective relay can cause the same symptom.

Thank you for the hint. Could you elaborate on the specific fuse or relay location that was problematic on your Opel Astra? I have already inspected the readily accessible fuses, but perhaps I overlooked a less obvious one.

I don't recall the exact location on the Astra, but it was within the main fuse box under the hood. Honestly, the fault finding was proving difficult, so I ended up taking it to a workshop.

Understood. Thank you for confirming the potential issue. I followed your advice and had a professional diagnose the problem. It was indeed a corroded connector near the fuse box, leading to the interrupted Terminal 15 signal. Repair cost was 95€. Appreciate your help.