This is the Metra 70-2104 2004-2006 GM Wire Harness.

Features:

• Car Harness Relocates Factory Radio in 2004-2006 Chevrolet Malibu Vehicles
• Allows users to temporarily connect factory radio without disconnecting aftermarket radio
• 24-Pin T-Harness
• Allows for the installation of an aftermarket radio using the existing factory wiring and connectors
• No cutting or factory wiring is needed