spetch
Full Member
Does anyone understand exactly how the steering wheel controls work? I was having some problems with the stock head unit, where steering wheel buttons would occasionally do the wrong thing. Like "seek up" would switch the radio band, for instance. Now with a new head unit and PAC module I get intermittent errors of buttons doing the wrong thing. It is configured correctly.
There are more buttons than there are wires, so it has to be more complex than simple open or closed 12v circuits. I'm wondering if the system works based on different output voltages coming down the harness from the steering wheel to the head unit (or module). Maybe each button applies a different resistor value, so it results in a different voltage that corresponds to a specific command. If the copper button pad gets old or the semi-metallic rubber feet buttons get worn, perhaps it could result in higher resistance when pressed, and maybe a different command is interpreted. I cleaned the contacts, but the problem continues. Anyone knows exactly how this works?
There are more buttons than there are wires, so it has to be more complex than simple open or closed 12v circuits. I'm wondering if the system works based on different output voltages coming down the harness from the steering wheel to the head unit (or module). Maybe each button applies a different resistor value, so it results in a different voltage that corresponds to a specific command. If the copper button pad gets old or the semi-metallic rubber feet buttons get worn, perhaps it could result in higher resistance when pressed, and maybe a different command is interpreted. I cleaned the contacts, but the problem continues. Anyone knows exactly how this works?