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2002 chevy trailblazer_ltz
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Discussion Starter · #1 ·
I recently installed an alpine CDE-123 in my Trailblazer using the GMOS 04. Install went well and everything works except for when the car starts (and the head unit turns on) there is a slight buzz and then a pop in the speakers (not to loud). This also happens when I turn the stereo off (a faint buzz that you can hear comes on once he HU is off) and then when I turn the HU back on it pops.

Car: I have a 2002, with the Bose stereo and OnStar

I have lots of experience with audio equipment (not in cars), so this is what I have deduced:
- The turn on pop (and buzz) is caused because the Bose amp is constantly on.
- Because I have an older Trailblazer the Bose amp does not come with a remote turn on wire.
I would love to fix this problem; my next step is to add a sub. But I want to get rid of the turn on pop before I do so. If I can add a noise filter of any kind or anything to fix the problem just let me know. (or maybe I wired it up wrong)

Sources:
http://forums.trailvoy.com/showthread.php?t=51827
http://forums.trailvoy.com/showthread.php?t=37637
http://forums.trailvoy.com/archive/index.php/t-51827.html
http://www.crutchfield.com/S-MrB0Kv451Qs/tech/kb350.html
http://forums.trailvoy.com/archive/index.php/t-31097.html
http://forum.sounddomain.com/ubbthreads.php/ubb/showflat/Number/177083/page/480
 

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2006 chevy trailblazer_ls
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239 Posts
Have you tried adjusting the potentiometer on the GMOS04 harness? That could be the cause.
 

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2002 chevy trailblazer_ltz
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Discussion Starter · #3 ·
Have you tried adjusting the potentiometer on the GMOS04 harness? That could be the cause.
yes, when i originally installed the harness I set my HU volume to one and turned up the potentiometer on the GMOS04 so that i could barely hear it (as suggested by others)

do you think that i may have turned it up to much?
 

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2006 chevy trailblazer_ls
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yes, when i originally installed the harness I set my HU volume to one and turned up the potentiometer on the GMOS04 so that i could barely hear it (as suggested by others)

do you think that i may have turned it up to much?
That is a good possibility. I would turn your radio up to listening volume and adjust it at that level so it will be quieter when your radio is turned down.
 

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2002 chevy trailblazer_ltz
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Discussion Starter · #5 ·
That is a good possibility. I would turn your radio up to listening volume and adjust it at that level so it will be quieter when your radio is turned down.
ok, Ill give that a try. do you think that is the cause of the turn on pop. im not so much concerned with the slight buzz as i am with the turn on pop. I dont want my speakers to blow out in a years time because they pop every time i drive the car.
 

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2006 chevy trailblazer_ls
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239 Posts
Did you ever get your issue solved?
 

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2002 chevy trailblazer_ltz
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Discussion Starter · #9 ·
no, still poping when i turn the stereo on

i am 99% sure that its a problem with the amp not turning off when the stereo turns off (not with the wiring harness or the HU). but im not sure how to fix that problem. the reason i think that the amp is constantly on is because i hear a slight buz in the speakers when the HU is off

i have done more research and have found out that earlier Blazers (the LTZ model) do not have an amp turn off wire built into the bose amp. (or at least i think)
 
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