Hola amigo, te dejo el pinout del stereo del Chevrolet Venture 2005.

• Car Radio Battery Constant 12v+ Wire: Orange
• Car Radio Accessory Switched 12v+ Wire: Yellow
• Car Radio Ground Wire: Black
• Car Radio Illumination Wire: Gray
• Car Stereo Dimmer Wire: Brown
• Left Front Speaker Positive Wire (+): Tan
• Left Front Speaker Negative Wire (-): Gray
• Right Front Speaker Positive Wire (+): Light Green
• Right Front Speaker Negative Wire (-): Dark Green
• Car Audio Front Speakers Size: 6 1/2″ Speakers
• Car Audio Front Speakers Depth: 3″
• Left Rear Speaker Positive Wire (+): Brown
• Left Rear Speaker Negative Wire (-): Yellow
• Right Rear Speaker Positive Wire (+): Dark Blue
• Right Rear Speaker Negative Wire (-): Light Blue
• Car Audio Rear Speakers Size: 6 1/2″ Speakers
• Car Audio Rear Speakers Depth: 3″

Espero que te sirva la info. Saludos.s