i understand this. it appears to be working. it turns on my "hack relay" and i feel the speakers are getting power. i have not been able (until tomorrow) to verify power to my RCAs.

i feel so far post #39 on page 4 is my only leading breakthrough. its 2am and i work at noon, ill hopefully get to test RCA function at that time. or by tomorrow evening. hoping cyber can give me insight on this random find.

 

Common is just another name for ground. I have my RCA's grounds for my sub tapped into the connector at the rear speaker to this one wire and it works perfectly. Once you test with your 1/8" to RCA adapter you will know if the remote wiring is working for sure. Heck you can take your home CD player and hook up the RCAs, turn your deck on to signal your OEM amp and see if you get sound. Have you tried the front RCA's of your new deck yet? Do you get sound from the rears when you hook up your OEM deck again?

Doug

 

Nah I haven't. I've been working most of the time. In the morning ill test all the RCAs.

Any idea why they would use com. Instead of grnd in this spot though? Any chance there's something different about it? Just theorizing.
Off to bed ill check in ASAP tomorrow with info on RCAs

 

Here is an excerpt from an article I found on the internet.

"When two or more devices are connected to a common ground through different paths, a ground loop occurs. Currents flow through these multiple paths and develop voltages which can cause damage, noise or 50Hz/60Hz hum in audio or video equipment. To prevent ground loops, all signal grounds need to go to one common point and when two grounding points cannot be avoided, one side must isolate the signal and grounds from the other"

So essentially com is short for common ground which sounds like a term used for signal wire. My guess is if you put ground on the wiring diagram, one might use it for ground for a power source which could introduce noise into the system like alternator whine. I've also seen speaker level wire out of a deck where there are 4 +ve and one common ground so it's not uncommon. Pardon the pun.

Doug

 

Ok so I pretty much am sure I don't have my RCAs working. I plugged the front speaker RCAs into a RCA>AUX and plugged the aux into my blackberry turned on the media, and no sound. Yes the car was turned on to acc. But I turned of the SRC(source of the radio) to prevent. Conflict of sound/signals also tried it with radio on but muted and volume turned to zero.

 

Just to clarify is this what you just tried?

Blackberry
to
Aux Input of Pioneer Deck
to
Front channel RCA of Deck
to
Rear channel RCA Metra wiring harness connected to OEM wiring harness

If this is the case you still haven't tested if the amp is turning on and eliminated it from the equation.

You need to test the following first, bypassing the deck entirely. With the deck still connected to the wiring harness, you need to turn on the deck to signal the amp to turn on. You can mute it so that you can hear the rears or put the volume to zero as you did before.

Blackberry with 1/8" to RCA
to
Rear channel RCA Metra wiring harness connected to OEM wiring harness

If you connect it to the Front channel RCA on the Metra wiring harness you won't get any sound as the RCAs are not hooked up to anything as in this diagram.



If you do this test and still get no sound then I would also test to make sure that the remote coming from the deck has a signal when you turn it on using your spot tester.

Doug

 

Ahh ok I did what u wanted but I tested front RCAs not rear. Dammit.

 

OMFG cyber ur the man with the plan.
RCAs work. Blackberry>metra RCAs(rear speakers) works so that means... Oh ****. My head unit isn't working correctly, right? The RCA rear outputs... So I should find a speaker I can hook RCAs up to and hook it up to the RCAs of the head unit to test the outputs..

 

First off lets see if you have a lemon head unit. Hook up the front RCAs from your head unit to the rear RCAs on the Metra wiring harness because now you've tested the OEM amp/wiring and know they work. I believe they are green and purple and see if you get sound out of the rear speakers. If not then it looks like both sets of RCAs on your head unit are defective. If you get sound then it's an electronic setting inside the unit which is what I suspected in the first place. I know you've tried but try again by doing this,



then this.



Let us know how it goes.

Doug

 

I've hooked up my rear RCAs to te front RCA outputs on the back and never got sound.