By removing the connector from the cruise module under the hood, I can measure all the resistor values by depressing the appropiate button. The on button is connected to the battery in series with a resistor. The horn works the same, but has no resisitor between the same 2 points. Rather then take the thing apart, I was hoping just to add a push button on the dash, with the correct series resistor, at least to prove it fixes the problem. If no one knows its value, I can hook up a potentiometer and try to guess it.
