Buzz noise in dash Key On Engine Off (KOEO)

eralimited57

2008 Sprinter 2500 170 Extended High Top 3.0L CRD
2008 NCV3 3.0L Diesel

I noticed in the colder weather that when I turn the key on (KOEO) but do not start I hear a buzzing noise that it louder than what I recall it being in the warmer weather.

Wondering what that noise is - sounds like it is coming from within the dash area?
 
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