C70 Driving Mode Errors

Whoa, sounds like a real head-scratcher! I had something kinda similar happen with my old Opel Astra, though it wasn't exactly the same. My radio would just cut out randomly, and sometimes the blinkers would go all wonky. The mechanic kept saying it was a loose wire, but they never really fixed it properly. Did you check all the grounds? That's usually the first thing I'd look at.

Could you elaborate on the issues you experienced with your Opel Astra? Were the errors consistently repeatable, or did they occur sporadically, as they do in my Volvo C70? Could you provide detail regarding which ground points you inspected, and what methodology you employed to ascertain their integrity?

Okay, so with the Astra, it was mostly random. Sometimes the radio would be fine for a week, then it would cut out three times in an hour. The blinkers were even weirder; they'd flash fast, like a bulb was out, but all the bulbs were good. Honestly, I didn't check the grounds myself; I just took it to my local shop. In your case, if you think it's the BUS system, I would take it to the shop. That sounds a bit too complex for a simple DIY fix.

I appreciate your detailed account and advice. Based on your experiences and the complexities involved, I shall have the vehicle assessed by a qualified technician. Repair costs are estimated at 155€. Thanks again for your time and expertise.