Metra WM-GM29-SWC Radio Data Interface & Harness for General Motors 06-up

The Metra WM-GM29-SWC is an aftermarket radio data interface and harness designed for General Motors vehicles 06-up. It delivers accessory power (12-volt 10-amp) while retaining R.A.P. (retained accessory power). Navigation outputs are included (parking brake, reverse, speed sense). This interface preserves factory chimes, steering wheel audio controls, and balance/fade functionality. Suitable for non-amplified and analog amplified factory systems. Firmware updates are performed via Micro "B" USB.