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

Radio (UQ4)


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Figure 2:

Power, Ground, Communication (UQ3)


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Figure 3:

Amplifier, Speakers (UQ3)


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Figure 4:

Digital Radio Receiver (U2K)


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Figure 5:

Redundant Radio Controls


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Digital Radio Receiver (U2K)