GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Radio Power, Ground, and Serial Data


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Figure 2:

Speakers (except UWP)


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Figure 3:

Amplifier (UWP)


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Figure 4:

Speakers (UWP)


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Figure 5:

Amplifier (UQ7)


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Figure 6:

Speakers (UQ7)


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