I have a 2003 G35 Seden, and recently the climate control and audio functions on the center console have stopped responding completely. No buttons work — I can't control the A/C, radio, or anything from the head unit. I can't fix it.

I'm wondering: if I replace the OEM head unit with an aftermarket one (preferably with Bluetooth), would that potentially restore control over the HVAC system as well? Or are the A/C controls completely separate?

 

Need help.

 

The HVAC controls are integrated into the head unit. They are a well-known failure point. You will need to track down:

• a working OEM head unit (risky with likely the same outcome)
• a JDM double din faceplate that fits your model with the correct controls (need to make sure it's for sedan and not coupe) and then follow Wrathernaut's install sticky;
• a Metra aftermarket double din with controls (ugly) and Wrathernaut's info

Just replacing the head unit is not enough to fix the HVAC. You also need the compatible controls.

 

Thanks for the detailed info! I actually already removed the head unit and even tried some soldering work on it. Unfortunately, I’m not skilled with soldering, so I wasn’t able to fix the two resistors that seem to be causing the issue.

I’m now leaning toward finding a proper JDM double din setup like you mentioned. Just need to make sure it’s for the sedan version. Appreciate the guidance!