First, I would check fuses #76 and fuse #14 in the fuse panel on the left side of the dash, if they are okay the amplifier inside the radio has gone out and you will need a new one. here is the wiring diagrams for the radio so you can see how the system works and how to remove the radio to install a new one in the images below. Also check fuses # 18 and #19 in the right-hand fuse panel.
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