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If your chime volume control in the settings does not affect the volume, it's on lowest setting and still way too loud, your radio's amp is shot. These chimes are controlled through the amp. You need to remvoe the amp, note the part number and purchase a used one from Ebay. All of these other fixes are useless. The amp is mounted on the back cabin wall. To access you need to remove the larger half of the rear seat. It's an easy fix once you have the new amp. The rear seat is two sections, the short side and the long side. There are 2 10mm screws that hold the short and long section of seat frame together then about 5 nuts that hold the long section of seat frame to the floor. Remove these and lift the seat up and out toward the front, just enough to give you access to the rear wall of the cab. You will find the amp mounted on the wall right between where the two seats meet, coverd by a layer of insulation. Unplug the old one, plug in the new one and then replace the seat. Your chime volume control will be restored.