If you have the Radio with Six-Disc CD, here's how to tell whether you have the Y91 LUX Amp, or the Non-Y91 Non-LUX Amp.
Press the AUTO EQ (Automatic Equalization) button.
If your choices include NORMAL, DRIVER, REAR, and SPACIOUS, you have the Y91, LUX Amp.
If your choices include CUSTOM or TALK, you have the Non-Y91, Non-LUX Amp.
Here are the TNR part numbers:
Y91 LUX - Part Number: 10377531
Non-Y91, Non-LUX - Part Number: 10377287
You must select the proper TNR for the Amp installed in your truck, or you will not get any audio. So far, all 2003s have the Y91, LUX Amp, 2004s may have either Amp (switchover during the model year), and 2005s have the Non-Y91, Non-LUX Amp. The Y91 LUX Amp communicates via the GM Class 2 Databus, while the Non-Y91, Non-LUX Amp does not. The LUX Amp has DSP.
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