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Rearview mirror wiring

Discussion in 'GM Electrical Tech' started by mild2012sierra, Mar 4, 2014.

  1. mild2012sierra

    mild2012sierra New Member

    Hi, I have a 2012 sierra sle, I was just wondering if anybody knows if there is a harness in the headliner for the rearview mirror? I want to ad an auto dimming mirror. I don't have onstar so I just got basic mirror. any help be appreciated
  2. mild2012sierra

    mild2012sierra New Member

    Nobody can answer this?
  3. 03 SIERRA

    03 SIERRA Rockstar

    i know when i pulled my headliner down on my 03 to do my roof lights the harness thats up there is one big harness all the way up the a piller. i already have onstar and auto dim so i wasnt looking for that but you may have to change the whole harness.

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