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There are cables leading to the rear audio that are unshielded and lay across the top of the cruise module. I had this buzz, slight but annoying which was noticebly associated with the cruise control locking onto a speed. I assumed it to be a data stream used by the stepper motor inside the cruise bleeding into those audio cables. My solution was to bend a little sheet metal to make a box covering the cruise module, then grounded that to the frame ground block near the rear brake reservior. Seemed to help.
There are cables leading to the rear audio that are unshielded and lay across the top of the cruise module. I had this buzz, slight but annoying which was noticebly associated with the cruise control locking onto a speed. I assumed it to be a data stream used by the stepper motor inside the cruise bleeding into those audio cables. My solution was to bend a little sheet metal to make a box covering the cruise module, then grounded that to the frame ground block near the rear brake reservior. Seemed to help.
