Originally Posted by Cutolds350
I've got the automatic climate controller.
I would try it without the resistor fix, as long as the digital display is working properly in the automatic A/C control.
I have owned 2 separate '96 Corvettes. The first was a base model with the manual A/C. When I replaced the radio with an aftermarket model, the sys warning was a problem and required the resistor fix.
I later owned a '96 CE fully loaded, with the automatic A/C. When I replaced the radio with an aftermarket unit, it did NOT require the resistor fix.
The sys warning displays because the computer does not see a load on the illumination circuit. If you study the wiring diagrams, the radio AND the automatic A/C controller both draw off that circuit. The manual A/C controller does not. Therefore, because the automatic A/C controller is still drawing/completing the illumination circuit, the sys warning does not appear. At least that is my theory.
Why don't you test it before the install. With the radio disconnected, start the car and turn on your headlights. Set the dimmer control in the center position. Give it a couple of minutes. Do you get the sys warning?