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I'm looking at 2016 wiring diagram (couldn't find one for 2017). This indicates ACC is connected to RADIO circuit (7.5A fuse) and the battery power is connected to the DOME circuit (20A fuse). Perhaps the setup works since ACC load is supposed to work like a switch for the relay, and the actual load is supposed to be driven by DOME circuit (i.e. 12V always-on from battery)?
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