Originally Posted by
fredygump
(I already purchased the real OTG cable, so when it arrives I can report back if I find that the Razr works any better with that cable. I discovered that the Razr doesn't power a device through it's USB, wherease the Note3 will power a device. So maybe with the correct cable and a battery in the car, the Razr will work? It'd be nice, but not a big deal.)
This is the key on that device. There are some out there that must have the car battery plugged in and then turned on in this case. Try that.
If that's the case you can either power up the car during this, or use a powered USB hub to get past it.