| Re: C4 Audio FAQ |
Subject: Re: C4 Audio FAQ by Klaus on 2008/6/6 12:57:52 I have a theory about the need for the resistor mod on later model C4s to prevent SYS codes due to the dimmer circuits becoming open when an aftermarket stereo is installed. I have owned 2 1996 models. One was a base model with the manual A/C. When I replaced the stereo with an aftermarket stereo the flashing SYS warning started, and it took the resistor mod to fix it. My current 1996 CE is equipped with the electronic A/C. I recently replaced the stereo with an aftermarket unit. The SYS warning is NOT happening, and I did not need the resistor mod. Looking at the FSM wiring diagrams, the electronic A/C also uses the dimmer circuits that the head unit uses. I suspect that is the reason that I did not need the resistor mod on this car. So, my theory is if you replace the factory stereo with an aftermarket unit in a late model C4 Corvette: If the car is equipped with the manual A/C option, you will need the resistor mod. If the car is equipped with the electronic A/C option, you will not need the resistor mod. |
