Hello. I removed my stock head unit today and set out to install my new Alpine iDA-X305S using Modifry's PNP harness and DCI. After doing the basic removal stuff, I connected the Alpine HU and tried to power it up to make sure it works before I put everything back together, and low and behold, it doesn't.

I took the radio out and set it up on a test bench. The radio works fine. Next I went back to the car and checked the voltages on the car/female-side of the Honda wiring harness and noticed that the ignition line doesn't go high when it is supposed to. I reconnected the OEM HU, turn the key and it goes on. I check the ignition voltage while the OEM HU connected and the key turned and it is high, although it is lower than the battery voltage by about 1 V.

Does anyone have any ideas of what my problem is? Thanks.
(Read the FAQ, searched forums and the internet. No luck.)

TL;DR
-With key turned, no ignition voltage from wiring harness without Honda HU attached (i.e. nothing attached or Aline HU attached).
-With key turned, about 11v ignition voltage if OEM HU is attached.
-WTF?

 

Upon further inspection, it appears that my PNP wiring harness from Modifry is incorrectly wired. I was not looking at the ignition voltage, but rather the power antenna lead because I was using the PNP as guide to the pinout for the Honda harness.


The red and blue wires on the blue connect appear to be swapped.
Compare to the image at: http://www.modifry.com/products/dci/pnp.htm

 

I cut it and spliced it. Works great now. Contacted Bob and got a refund for the cost of the cable very quickly. Overall, annoyed that I spent way too much time to get it to work, but it happens and I'm more than satisfied by Bob's quick response.