Originally Posted by nrwilk
So, is it true that if I use your i85 harness as it is, I will only be able to undim the display on the HVAC by turning off the headlights?
If you mean the i88 harness (which is the one I make for the JDM A/C panel install), yes I think that will be the case. The car's dimming control module definitely does not change the illumination + signal when you press the BRIGHT button (since that line is also used for the tail and marker lights). I don't think the BRIGHT button alters the voltage on the illumination - (minus) wire, either. [If someone could confirm that, I'd appreciate it!]
i85 is the other 8-pin harness that includes the wires for the aux input on 2007-up models and steering wheel audio controls.
If you would like to play with the dimmer cancel signal, I can send you an extra pin/wire that will fit the factory i85 plug.