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Pac Radio Replacement Chime Retention For Select '06-'17 Gm VehiclesgM Radio Replacement Interface for with non-amplified or standard Bose amplified audio systems gM 29-Bit LAN (14-Pin & 16 Pin connectors) The entry model LcgM29 retains the factory warning chime sound through a built-in piezo speaker and provides a 12v Acc output for the aftermarke..