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Hi Spanner, sorry for the delay responding, I do Hyundai car stuff and get a bit busy moderating those forums.
Anyhow, I would discount any audio-related suppression as those circuits involve wire-wound chokes (measured in micro-henrys (yeah, it always raises a smile)) with a capacitor used to smooth any spike raised during a power-on/off event.
To diagnose which circuit this component comprises a part of, would need you to follow the white wire to its delivery module, to see/show what it is connected to.
FWIW: I studied high-energy physics (for BNFL) and microelectronics at what used to be known as Manchester Polytechnic in the 70's. I appreciate the technology has moved forward at an impressive rate but the basics are still there, hopefully
Currently in Shambles's garage:
2008 Hyundai i30 CRDi 1.6L Black; 2003 RAV4 vvti NRG