Once the stereo box is removed from connectors, there will be 3 cords attached to the box.

The yellow wire will require some force to open because it serves as the power connector for the stereo.

Carefully push down on the clamp to disconnect the yellow wire on the far left of the box.

Push down on the clamps in the middle to remove the middle wire.

Push down on the clamps in the middle to remove the far right wire.