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There are not any other components between the steering wheel switch and the audio unit. There is a roll connector near the base of the steering column that connects the wiring harness from the steering wheel components to the wiring harness going to the audio unit.
This should be checked for loose connection or broken wiring. If ok, I suspect the wiring harness in the steering column for the audio steering wheel switch is damaged and the harness will need to be replaced.
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Those components connect to a wiring harness that goes down the steering column and connects to another wiring harness that goes to the main audio unit. It is likely that that wiring harness is damaged on the audio volume circuit. The only other cause would be a failure in the main audio unit itself on that circuit.
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