But, nothing states the ECC unlocks, even partially to allow slippage for turning on high traction surfaces. It would have to though, so we all assume it does. Maybe a Wrangler Owner could confirm this, I would think the Wrangler O.M. would warn about engaging 4X4 on high traction surfaces and trying to turn. The Compass O.M. has no such warnings for engaging 4WD Lock, which I suspect the reason why is because the system recognizes the vehicle is turning and unlocks the ECC, at least enough to allow slippage for the turning.