Child safety locks are designed to limit opening a rear door from inside the vehicle. Depending on the model, the setting may be controlled at the door or through an electronic switch. An indicator can confirm the feature is active rather than announce a malfunction.
Check the instructions for your vehicle before changing the setting, and test the door while safely parked. If the door still behaves unexpectedly, explain which handle or switch is affected when contacting 12th Street Auto Care Center in Sioux Falls.