If, in fact the Pioneer dimmer circuit requires a positive voltage to dim the display, I'd say splice into the positive side of the PRNDL (automatic transmission shift lever) illumination bulb wiring in the console.
I checked these bulbs tonight on my truck, and they are NOT always on - They come on when the dash sensor turns on the headlights. If your lights are always on, then you have some other problem that needs to be fixed.
I will post a couple of wiring diagrams. Look for PRNDL circuit 230.
|