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Old 03-17-2016, 04:17 AM   #1
TrailblazeLTZ

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Sound issue after installing aftermarket HU

I just installed a stereo in my 02 Chevy TrailBlazer LTZ. It has a Bose audio system, with Onstar, and steering wheel controls. I got the PAC RP5-GM11 interface to install an Alpine CDE-143BT stereo.

My problem is that the sound is very quiet and when I try to turn up the volume it gets all staticy. Everything else seems to be working fine.

This is how I wired up the harnesses:

----PAC RP5-GM11 ------------ ALPINE CDE-143BT

yellow ------------------ yellow
black ------------------- black
red/yellow/black>red ---- red
white ------------------- white
white/black ------------- white/black
grey -------------------- grey
grey/black -------------- grey/black
green ------------------- green
green/black ------------- green/black
purple ------------------ purple
purple/black ------------ purple/black
blue/white -------------- blue/white
orange/white ------------ orange
red/white --------------- nothing
purple/white ------------ nothing
green ------------------- nothing
blue -------------------- nothing
nothing------------------ blue

PAC RP5-GM11 instruction ALPINE CDE-143BT manual

This is my first time ever installing a car stereo.

Last edited by TrailblazeLTZ; 03-18-2016 at 03:42 AM. Reason: adding links
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Old 03-18-2016, 01:55 AM   #2
TrailblazeLTZ

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I think its an amplification problem. The little sound I am getting is when the POWER IC is turned on in the settings which uses the built in amp in the HU. I switched it to off to use the external amp (bose amp built in vehicle) but get no sound at all.

I'm gunna double check the blue/white amp turn on wires and if that's not it I'll see if the stock stereo still works with it. If it doesn't than I'll try to replace the fuse to the amp.

Last edited by TrailblazeLTZ; 03-18-2016 at 03:03 AM. Reason: adding
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Old 03-18-2016, 03:38 AM   #3
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Also could it be a ground issue? I only connected the ground wires to each other and didn't connect them to the chassis. Was I suppose to?

Last edited by TrailblazeLTZ; 03-18-2016 at 03:43 AM.
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Old 03-19-2016, 03:21 AM   #4
TrailblazeLTZ

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Well the stock stereo still works and the blue/white wires are connected good and the ground should work but still nothing. I don't get it.
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Old 03-19-2016, 04:17 AM   #5
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Solved

Ah I figured it out finally. I just unplugged one of the harness plug things in the PAC interface from the slot labeled "factory amplifier audio" and plugged it into the "non-amplified factory audio" slot. I feel a bit dumb now. This thread was pointless. But still I'm pretty sure I have the Bose amp. I have the LTZ version which has a bunch of extra features and the stock stereo was the one for the Bose system according to the owners manual. I could tear apart the rear interior panel to check but whatever its all good now.
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Old 03-19-2016, 12:52 PM   #6
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Shine a flashlight through the front door speaker grills. The Bose package has a larger door woofer, and the magnet is on the front instead of the rear like a standard speaker. If you don't see an odd-looking speaker with a front magnet, you probably don't have the Bose package.

Anyway, as long as it's working properly in the non-amplified position, it doesn't really matter.
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