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Username Post: '05 Trailblazer radio problem        (Topic#237680)
photoman250 
Forum Newbie
Posts: 42
photoman250
Age: 49
Loc: Mobile, AL
Reg: 03-12-10
03-13-10 10:32 AM - Post#1879341    

The radio in my wife's 05 Trailblazer seems to have a mind of it's own. It works when it wants to, when it doesn't, sound is from the front speakers only and there's no bass at all. Sounds like an old AM transistor radio. Any Ideas? It doesn't do this all the time, sometimes it works just fine.

Thanks, Bill
2005 Trailblazer LS
2007 Silverado Classic


 
LMC Trucks
87MCSS 
Contributor
Posts: 205

Reg: 11-08-09
03-13-10 12:24 PM - Post#1879390    
    In response to photoman250

Simple stuff first.
Connections to the speakers in the rear.
If its one of those rear setups where is has its own amp, then the connections to it.

 
photoman250 
Forum Newbie
Posts: 42
photoman250
Age: 49
Loc: Mobile, AL
Reg: 03-12-10
03-13-10 06:09 PM - Post#1879589    
    In response to 87MCSS

Oh how I wish it were that simple. It's a standard 4 channel system. When it's working right, there's good sound from all 4 speakers. But when it poops out, the back speakers produce no sound at all, and only high freqs from the front. I have thought about bad or loose connections but those are usually influenced by bumps or jolts. This problem occurs seemingly when it wants to, and the same result every time.
2005 Trailblazer LS
2007 Silverado Classic


 
gchemist 
Senior Chevytalk Moderator
Posts: 22090
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
03-13-10 06:22 PM - Post#1879602    
    In response to photoman250

Is there an amp in the rear? Is the four speaker system stock?
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
87MCSS 
Contributor
Posts: 205

Reg: 11-08-09
03-13-10 08:02 PM - Post#1879657    
    In response to gchemist

Alot of newer GM cars and trucks have a separate amp for the rear speakers to help boost the rear volume level up and this aids is bass output. Its still looks and connects like a factory 4 speaker system, its just the rear wires go from the head unit to the amp then to the speakers.

So it could be a problem with the amp and or wires.
If it has no rear amp and comes and goes like you state then its a internal problem with the head unit and has no fix unless you know electronics.

 
Randy_W 
None
Posts: 27804

Reg: 01-06-02
03-14-10 04:43 AM - Post#1879766    
    In response to 87MCSS

Where is the amp?
Randy

DON'T mess with Old Men, we didn't get old by being, STUPID!!!

"The veneer of civilization is very thin!" (Arlo)


 
87MCSS 
Contributor
Posts: 205

Reg: 11-08-09
03-14-10 08:01 AM - Post#1879860    
    In response to Randy_W

Don't own one or have a owners manual for one.
But my 04 Monte has it between the rear deck speakers.
A Equinox has one under the seat cushion, drivers side.
I just know that the stereo's over the basic in these newer vehicles have amps to aid bass drive, which the rear speakers are larger and have frequency ranges below 80hz.

 
Randy_W 
None
Posts: 27804

Reg: 01-06-02
03-14-10 12:00 PM - Post#1879968    
    In response to 87MCSS

Found it, under the panel in the rear cargo area left side below the side glass.
Randy

DON'T mess with Old Men, we didn't get old by being, STUPID!!!

"The veneer of civilization is very thin!" (Arlo)


 
photoman250 
Forum Newbie
Posts: 42
photoman250
Age: 49
Loc: Mobile, AL
Reg: 03-12-10
03-14-10 01:47 PM - Post#1880020    
    In response to gchemist

I really don't know if this one has an amp or not. Guess it's time to do some digging. I know at times it sounds like there's more bass from the front speakers than the rear. been considering just snatching the whole thing out and going Sony, but my Dad is concerned a possible security device in the stock unit.
2005 Trailblazer LS
2007 Silverado Classic


 
87MCSS 
Contributor
Posts: 205

Reg: 11-08-09
03-14-10 02:06 PM - Post#1880030    
    In response to photoman250

There is a security device in the factory ones, but thats more for being stolen then anything else.
If the unit is taken out of the vehicle without the pass code feature turned off it cannot be used in anything else.


 
Randy_W 
None
Posts: 27804

Reg: 01-06-02
03-14-10 02:21 PM - Post#1880040    
    In response to photoman250

If it has Onstar, that also is connected, to use an aftermarket unit on one with Onstar you need an adapter unit.
Randy

DON'T mess with Old Men, we didn't get old by being, STUPID!!!

"The veneer of civilization is very thin!" (Arlo)


 
photoman250 
Forum Newbie
Posts: 42
photoman250
Age: 49
Loc: Mobile, AL
Reg: 03-12-10
03-14-10 03:32 PM - Post#1880077    
    In response to Randy_W

It has OnStar but not used. Thinking about getting a Chilton manual so I can locate everything without ripping her truck apart. The thing that really ticks me is that a stock unit will cost 150.00, while a Sony with cd/mp3, and the install kit is only 92.00.

Thanks guys for all your help, I'll let ya know what happens.

Bill
2005 Trailblazer LS
2007 Silverado Classic


 
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