Factory Radio Wiring Diagram

first time on any forum so i hope im following the rules i just got a quick question, i got an 05 buick rendezvous and want to add my sony stereo but its got the retention accessory power interface and i cant afford to buy the expensive wiring harness can i just tap into the wires and run my stereo off them , so ill have basically 2 stereos but will only use my sony will that be ok as long as i follow the diagram

 
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Bassically85

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