DTC B2900-00: Sound Mood Lamp Local Lin Error: General Description
WARNING: This page is about a different car, the 2021 Kia Soul. However, it is still accessible from the selected car via links, so may be relevant.
The Sound Mood Lamp (SML) unit consists of the slave controller, and the master controller which could control the slave. Each of the mood lamps have a slave controller, and the slave controller adjusts color and light from the master controller.