Lastmohecken, good analysis of the variables. I have a (Yahama-equipped) Haibike which died precipitously. The nearest dealer (on Haibike's site) was listed in Iceland since they had (permanently or temporarily) left the US market. Turned out to be a malfunction in the ON / OFF / PAS switch, and fortunately the local Giant dealer was familiar with the issue and had a replacement part since the system was similar to Giant's. If the problem had been with my BBS02-equipped bike, I would have been able to detect it, and change a relatively inexpensive part. It cost about $220 to have the Haibike repaired.