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This is part 2 of the post I started about installing an Alpine IVE-W554ABT headunit in my V35. The first post covered the basics of getting started, pulling wiring through from the boot and assembling the headunit into the stock brackets. This post finishes up the install description with the rest of the wiring that was done in the boot and at the back of the headunit.

Wiring up the headunit's wiring harness to the Metra 70-7550 was quite straight forward. I hooked up everything apart from the rear speaker connections because in my case, I had separate wires for those running from the speakers and into the centre console. So you can see the purple and green wires in the photo no connected to the Metra harness, I soldered them directly to the speaker wires in the centre console. Some wiring was not necessary so I just isolated those, but didn't pull them out.
IMG_0747.jpg


Here's a wiring diagram that I used, it's from the Wrathernaut's Double-Din Installation FAQ, Shopping and Resource List.


non-bose-wiring.png


Note: The reverse signal wire was NOT purple as per the diagram, it was in fact Orange, even thought I have a coupe.

The rest of the wiring for the headunit had to be connected too, this includes the antenna, rear camera, etc. We also put the headunit assembly back in place and connected all the stock wiring to it for the aircon control, navigation, etc.

The difficulty came next, the front speakers...I didn't want (or rather it was next to impossible) to run new wiring from the doors to the centre console, so I used stock wiring. This didn't work unless I had the stock amp running, and that sounded terrible. So we decided to see if we can bypass the amp somehow. Well, turns out you can but it's a total pain to find the information.


I managed to track down the following wiring sheet:
Amp-Bypass-Wiring.png


This made the job so much easier, so I removed the stock amp and trialled the bypass...
IMG_0754.jpg


It worked! The front speakers were loud and clear, exactly as they should be, and they were running off the headunit too. At this point I clipped the stock amp wiring and connected the relevant wires together as per the diagram (FR+ input to FR+ output, etc).
IMG_0755.jpg


With the wiring all done we put the car back together.

We did try to get the steering wheel controls working, but were not sure what should be connected where because the wiring colours did not match the G35 Driver wiring charts. We were also not certain where the M39 harness actually was. I'd like to revisit this at a later point but for now the steering wheel controls do nothing.

-i

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