Aftermarket radio wiring harness color codes?

2005 PONTIAC BONNEVILLE
1,783,600 MILES • 6 CYL • 2WD • AUTOMATIC
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RACINE BONNVILLE
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I bought an aftermarket radio wiring harness and need to a color code and function for each wire.
Dec 11, 2025 at 10:20 PM
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STEVE W.
  • ✓Experienced Mechanic
  • 15,404 POSTS
The attached are the diagrams for both the base and full optioned systems. The first 3 are the base radio without an amp. The others are the amp and digital (xm) modules. The base radio power and outputs are the same with the amp, they just go to the amp instead of speakers.
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Dec 12, 2025 at 4:01 AM
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