Theory Of Operation
WARNING: This page is about a different car, the 2016 Dodge Journey and 2015 Dodge Journey. However, it is still accessible from the selected car via links, so may be relevant.
All Electronic Pedestrian Protection Module (EPPM) modules destined for service part usage are shipped in a state that inhibits the deployment of all supplemental restraint squib circuits (EPPM unlocked) for safe, initial installation. Once the EPPM initialization procedure is performed (EPPM locked). The EPPM enters a full state of readiness and can no longer transition to the unlocked status.