If I remotely erase my iPhone, will it still be usable?
I bought a 2nd hand iPhone 5c which is on iOS 9.3.1 from an eBay shop. I was able to set it up and restore it from the backup from my previous phone. Unfortunately, it doesn't work properly and now I need to send it back. I've been told by the vendor to wipe the phone before sending it back. The problems I had with it was that it kept switching itself off and now I can't switch it on at all to wipe it. I can't connect it to iTunes either. The vendor has asked me to send it back with my passcode and iCloud password which I'm not willing to do.
My question is: if I remotely erase from "Find my phone" within iCloud (which is switched on for this phone), will it leave the phone in a state where the vendor will be able to use it, assuming he can fix it, but without him being able to access any of my data?
iPhone 5c, iOS 9.3.1