Circuit/System Description

When certain modules are programmed and configured during installation, the module learns a specific environment identifier which is unique to the vehicle. The environment identifier is used to prevent the swapping modules between vehicles. The UHF Short Range Low Energy Remote Control Access Transceiver is the keeper of the environment identifier. The instrument cluster, electronic brake control module, HVAC control module, inflatable restraint sensing and diagnostic module, drive motor control module (DMCM), Virtual Key Sensors, and steering column lock module (if equipped) each learn the environment identifier during their configuration process. During vehicle operation, the body control module (BCM) sends an identifier as a challenge and each module responds to the challenge by sending the environment identifier back to the Near Field Communication Module. If the UHF Short Range Low Energy Remote Control Access Transceiver sends an incorrect immobilizer identifier or if a specific number of incorrect environment identifiers are received, vehicle start is disabled.