Rear speaker problems

[SkeetMc]

This past weekend for some reason I decided to finally take out the factory cd player in our '98 Chevy S10 Blazer & put in an Alpine CDA 9827 that we have had for a few years. I installed it with the Metra faceplate kit & wiring harness GM 4001....the problem is...when the factory cd player was in there, the back speakers (rear door) were working...now that the 9827 has been put in they arent working...only the fronts....everything is wired correctly. Im wondering if the wiring harness is the correct one?...I was given that one by the people at Best Buy....not sure if they are "dummy wired" or I remember at one time back in the day...when you removed your head unit & reinstalled it...as somewhat of a theft measure...when you hooked it back up it would work...you had to disconnect it & redo it. Any thought as to why the speakers arent working all of a sudden?

Click to read more...

 

[jrdnhsnbrg 10+ year member]

I'd bet something is either wired wrong or a setting in the head unit needs adjusting. Check your balance and fade settings.

 

[keep_hope_alive Premium Member]

the late 90's blazers i've worked on had amplifiers in the rear (driver's side behind side panel). if that amplifier doesn't get a turn-on signal you won't get sound out of some speakers. make sure the blue-white wire is connected into the harness.

 

[SkeetMc]

K.h.a.....I think you are correct....but after looking into it a little more...I believe Best Buy has sold me the wring one which happens to be discontinued..(gm-4001)..its missing the blue/white wire & the correct one with it...the 70-1858 that has it. So its off to Best Buy to swap it out. Thanks for yalls help.