DIY – NAV System Conversion with working rear defrost

dts3

Why is it that installing a new HU will cause the defrost not to work any longer? I ask because it seems like every time I pull the battery I somehow **** something up (sent stock radio into security protection mode, got myself a nice flashing airbag light) and I just want to make sure I don't move on to disabling the defrost; it's cold in Michigan this time of year, and I need my defrost lol

2SIC4U

Someone years ago did this conversion but never figured out the rear defrost. I was able to figure out why and my solution is posted above. The Nav system, digital AC controls, and radio are all one unit. In the None Nav version, the AC unit is analog. This is why you need to change the AMP being used from the nav to none nav and add pins. The pins are to send the analog signals that are not needed in the nav version.

radensb

This isn't entirely accurate. The Navi AC system is controlled via the CAN bus. There is an AV CAN bus that interfaces with the Navi AC/Stereo control panel and communicates to the stock HU. The stock HU translates that communication into different CAN messages on the main CAN bus that connects to the HVAC Amp.

The non-Navi controls are also digital, but they communicate directly to the HVAC Amp via a dedicated serial interface (No CAN bus). There is no analog AC control in the Z.

One of the goals of my current project is to make this conversion a plug-n-play experience with the non-Navi controls interfacing with the CAN bus system.
eZ Navi Delete Project

Also, I have sourced the needed 10 position connector for the non-Navi control module locally from Mouser Electronics:
TE Connectivity - 936163-2 - $1.53 - Way easier that ordering from Japan

khite100

This write-up is great. I too am doing the conversion. I just got the A/C controls working last night. Feeling good about the project.