Radio Module Interface
Sierra 1500 Base Model; Retains Retained Accessory Power; Digital Amp Optn. REF ID Sticker For RPO Code Y91~These Vehicles Have A Digital Amplifier Option
Radio Module Interface
w/ Steering Wheel Control; Either Use The AX-GMCL2-SWC or Bypass The Amplifier~These Vehicles Have A Digital Amplifier Option~if Y91 is Present Then The Vehicle is Equipped w/ A Digital Amplifier~Reference The Part Identification Located In Glove Box For The RPO Code Y91