Metra Kit adding SW controls PAC-RC or ASWC-1 - RX8Club.com



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Old 05-09-2018, 06:26 PM   #1  
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Metra Kit adding SW controls PAC-RC or ASWC-1

So I am toying with the idea of replacing my factory headunit with an Android aftermarket one.

I've done some research and searching here but I have a couple of questions:
1. Does the Axxess adapter box that comes with the Metra kit have a connection spot for the ASWC-1 or does the ASWC-1 tap directly into the factory wiring harness, it seems like it is the later.
2. Assuming its the later, I have a PAC-RC that I pulled out of my Saab when I removed the Android headunit out of that, it appears according to Pac's instructions it should also be compatible with the RX8 (in fact it appears to use the same input wire too), any benefit to not using it vs. buying the ASWC-1. If I have to tap into factory wires with either then I'll just save the money, I was only considering the ASWC-1 if it actually plugged into the Axxess box and made wiring super simple.
3. My Android headunit has RCA outputs and my car has the Bose system, from what I have read here is the Bose system expects low level inputs (i.e. RCA from the HU), I'm assuming with the stock headunit they run through the stock connector. Are all the speakers in the car ran through the Bose amp or only some (I know in my Saab only the factory door speakers ran through the amp, so it needed high level outputs to the dash/rear speakers and low level to the door via the amp).
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Old 05-10-2018, 02:11 PM   #2  
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Quote:
Originally Posted by jakejm79 View Post
So I am toying with the idea of replacing my factory headunit with an Android aftermarket one.

I've done some research and searching here but I have a couple of questions:
1. Does the Axxess adapter box that comes with the Metra kit have a connection spot for the ASWC-1 or does the ASWC-1 tap directly into the factory wiring harness, it seems like it is the later.
2. Assuming its the later, I have a PAC-RC that I pulled out of my Saab when I removed the Android headunit out of that, it appears according to Pac's instructions it should also be compatible with the RX8 (in fact it appears to use the same input wire too), any benefit to not using it vs. buying the ASWC-1. If I have to tap into factory wires with either then I'll just save the money, I was only considering the ASWC-1 if it actually plugged into the Axxess box and made wiring super simple.
3. My Android headunit has RCA outputs and my car has the Bose system, from what I have read here is the Bose system expects low level inputs (i.e. RCA from the HU), I'm assuming with the stock headunit they run through the stock connector. Are all the speakers in the car ran through the Bose amp or only some (I know in my Saab only the factory door speakers ran through the amp, so it needed high level outputs to the dash/rear speakers and low level to the door via the amp).
1) It taps into the factory harness. I grounded mine separately recently, as it kept being flakey due to it sharing a ground with the HU (I know, shouldn't share grounds; I did the initial wiring 4 years ago in a huge hurry, lol)

2) I don't see why it wouldn't work with the 8.

3) I'm pretty certain the Axxess box takes care of this (you just wire everything to the correct wire from the HU's harness). As far as speakers and what the amp controls, check the sticky. I do know the door speakers have their own amps. Not sure of their high or low level (nor will I care when I eventually gut the Bose **** out for aftermarket).
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Old 05-11-2018, 11:30 AM   #3  
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Thank you, I actually thought about this a little more and I'm guess the SW controls are just the resistor array kind rather than a serial/bus transfer. In that case I may be able to wire directly to the Android headunit since it expects the resistor based controls via the wires for SW control input (on my Saab this worked with the exception of one button, hence why I installed the SWI-RC). I guess I'll try without it first and then add it if necessary, but you are right it does appear like it should work instead of the ASWC-1

OK the way I understand the BOSE system to work is that the headunit just outputs a standard 4 channel signal but then the BOSE amp is more of an amp/crossover/DSP taking that 4 channel input and sending it out to the various speakers and also onto the door speakers that are woofers and get there own amp?

I have read of some people suffering with distortion and loud volume (even at what is effectively a low volume level on the HU) when connecting to a BOSE system, it would be nice if the AXXESS box took care of things, but in their instructions they make no mention of setting the system up for BOSE or non BOSE so I'm not sure how it would know. My assumption is that the BOSE HU outputs 4 channel low level outputs and the standard HU outputs 4 channel high level, does this seem right?
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Old 05-12-2018, 06:26 PM   #4  
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I have an S2, and I'm pretty sure the Bose wiring is the same. I connected the factory speakers to the RCA pre-amp outputs in the new HU, it's working perfectly.

I used the PAC RP4-MZ11, it came with rca plugs and everything, I just had to connect the red, black, yellow and blue wires to the HU and that was it.
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Old 05-12-2018, 06:38 PM   #5  
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Thank you, I think I am going to go with the resistor padding method and use the speaker outputs from the headunit, this should make the wiring a little bit cleaner (I wont have 4 pairs of wires on both the HU wiring loom and then on the AXXESS box not used). My headunit also has pig tails for the RCA outs so I can just not plug those in since they wont be used, that means less clutter of wiring behind the headunit and I've heard a few people have had alternator whine issues using the RCA outputs to the BOSE system.

I have ordered a spare Mazda wiring adapter so I can steal some pins out of it (I understand the AXXESS box doesn't have pins populated in the n and p (SW1 and SW2) spots, I'm hoping I can just connect those directly to the SW1 and SW2 inputs on my headunit.
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Old 05-17-2018, 02:02 PM   #6  
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So I am a little confused by the wiring on the Axxess box, seems to be duplicate RR speaker wires, I have one pair of green (green and green/black) that come out of the orange plug/socket with the other speaker wires (white, purple and gray) but then there is another pair that comes out of the Axxess box. The ones coming out of the box are also labeled right rear speaker +/, seems like they are duplicate?
Also I have an orange and orange/white wire coming from the Axxess box, I'm guessing the orange wire (illum/dashlight) goes hot +12V when headlights/dash lights are on, the other orange/white wire is labeled dimmer, I'm assuming this is a PWM or 1-12V variable signal depending on dash lighting intensity. My HU (a generic android one) doesn't have dimming LEDs, they are even on or off (the screen also dims a fixed amount when the buttons light up). I assume I just want the orange wire, since the HU wont really handle the variable input well.

Other than that I have wired the speaker connections from the head unit to the harness socket in the kit via way of some pad resistors (I believe this should take care of dropping the high level speaker output from the android HU to the line level input the Bose amp expects - this seemed like a more reliable way to do it with regards to alternator whine vs going RCA to wiring harness).
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