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post #1 of (permalink) Old 10-02-2017 Thread Starter
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2010 Impala -- Line output converter producing loud signal after key is turned off?

Hey everyone, my brother in law has a 2010 Impala that I was helping him install just a basic mono amp and subwoofer and keep the factory head unit. I pulled the left and right rear channel signals from the rear deck lid speakers, and wired them into the corresponding wires on the line output converter that he has.

Specifically, the line output converter we're using is the PAC PDLC21. The reason we're using this is it provides an automatic remote wire that detects a signal from the speakers and powers the amplifier on instead of having to find a remote on wire in the car thats only hot when the key is turned on.

Everyone thing works perfect when we turn on the car. Subwoofer plays perfect, everything sounds great, amp turns on when the rear speakers start pumping out a signal. When we turn the car off, the amp stays on for a minute or two, but after about a minute of the car being off, the subwoofer just starts hitting as hard as it can until i pull the RCA cables from the amp to stop the sound. I've never had that happen before, and i tiested this specific line output converter in my truck and it works exactly as it should. What would cause this to happen?

Does anyone know specifically which wire I can tap into on a 2010 Impala standard for the remote on wire for the aftermarket amplifier? I would greatly appreciate any help i can get here!

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post #2 of (permalink) Old 10-06-2017 Thread Starter
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tttop, this car is coming back to me tomorrow to get resolved, can anyone point me to a remote wire for the amplifier that is only powered on when the key is on? Thank you!
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post #3 of (permalink) Old 10-07-2017
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Originally Posted by Captain McFunk View Post
tttop, this car is coming back to me tomorrow to get resolved, can anyone point me to a remote wire for the amplifier that is only powered on when the key is on? Thank you!
Here's what I found, but not sure how helpful it will be.

The nearest drawings I have are for 2008, and they give me conflicting info.

One drawing, listed under "Radio/Navigation System Schematics", for "Power, Ground and References", shows a pink wire running between radio connector X1-pin6, antenna module pin 1, and audio amplifier X1-pin 8.

Another drawing for "Audio Signal Communications - UQ3" shows an orange wire between radio X2-8 and audio amp X1-11.

I'm guessing the "UQ3" reference is an RPO code. You can check your RPO sticker to see if it is listed. That is, if it's listed, that will encourage me to think the orange wire is what you want.

The factory amplifiers are mounted in the rear deck. So I'd start there looking for the orange and/or pink wires.

The drawings seem to indicate that the signals are active high, meaning they are at or near 12V when the system is on. If your sub amp has any sort of polarity select for the "remote" wire, set it for high - ie, for whichever setting appears to indicate high such as +Batt or +12V. (For example, on my Pioneer 1400, there's a setting which selects the polarity for the signal indicating when the reverse lights are on.)

HTH.

Doug

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