I have an 07 Yukon slt. I am pulling my hair out trying to vcim swap for Bluetooth. I first bought part number 20842731. After plugging it in I had a green light but I could not connect to on star or Bluetooth. I pressed the talk button as well as on star button on mirror but didn't get anything. After thinking I had the wrong part number I bought 25984444 and installed it. Same thing happened. can someone help me please?