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  • C5 Vette radio, CD volume low. Ideas?
  • C5 Vette radio, CD volume low. Ideas?
  • C5 Vette radio, CD volume low. Ideas?
  • C5 Vette radio, CD volume low. Ideas?

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  1. #1
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    Help C5 Vette radio, CD volume low. Ideas?

    Just bought a 2003 Vette. Bose radio system, volume very low. Sound from all speakers, tried SCV adjustment.

  2. #2
    Moderator Toms007's Avatar
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    Well, gwbarney, first off a "Welcome" is in order. I think you'll find some really knowledgeable and helpful people here. One of them will be by here shortly to give you a hand.
    2007 Atomic Orange Coupe Cashmere/black interior

    2005 CruiseFest Attendee (Bowling Green, KY) 2007 CruiseFest Attendee (Colorado Springs, CO)
    2008 CruiseFest Attendee (Cleveland, OH)
    2010 Cruisefest Attendee(Effingham, IL)
    2011 CruiseFest Attendee(Effingham
    , IL)

    Formerly owned Corvettes: 1964 coupe, 1994 coupe, 2001 coupe


  3. #3
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    Check fuse 28 in the passenger fuse box. That is for the large Bose bass speakers in the doors.

    If that is not it then it is your radio or the Bose signal processor. I can provide guidance for removing the radio first to test it.

    The radio sends it's initial output to the Bose signal processor. From there the processor sends the signal to the front Bass speakers AND back to the radio. The radio then sends the signal to the rear speakers and the two other front door speakers. An amp is in each front door for those bass speakers and the radio provides the signal amplification for the rears and the other two front door speakers.
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  4. #4
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    Quote Originally Posted by dadaroo View Post
    Check fuse 28 in the passenger fuse box. That is for the large Bose bass speakers in the doors.

    If that is not it then it is your radio or the Bose signal processor. I can provide guidance for removing the radio first to test it.

    The radio sends it's initial output to the Bose signal processor. From there the processor sends the signal to the front Bass speakers AND back to the radio. The radio then sends the signal to the rear speakers and the two other front door speakers. An amp is in each front door for those bass speakers and the radio provides the signal amplification for the rears and the other two front door speakers.
    Thanks for the info, I checked the fuse labeled Bose, 20A. Not sure if it was FU28. And swapped the Bose relay with the rear defroster. Same part number. The radio HU was already replaced with a known good unit from a 1999 Vette. Is the Bose signal processor a separate unit behind the radio? I've had the Radio Module Power Supply suggested too.

  5. #5
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    The is no Radio Module Power Supply.

    Check fuse 24 in the I/P box also. It says Antenna but it also provide power to the signal processor.

    Did you replace the radio because of this issue?

    The signal processor is next to the gas petal.
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    Quote Originally Posted by dadaroo View Post
    The is no Radio Module Power Supply.

    Check fuse 24 in the I/P box also. It says Antenna but it also provide power to the signal processor.

    Did you replace the radio because of this issue?

    The signal processor is next to the gas petal.
    Dadaroo, Is that fuse 24 in the passenger (I/P?) box? I'll check when I'm off work tomorrow. Also how to remove & test the signal processor if fuse 24 is ok? I really appreciate the tech info. Thanks

  7. #7
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    Yes that fuse is in the passenger foot well fuse box.

    I don't know of any way to test the signal processor except to try it on another car.

    Still would like to know when you replaced the radio, before or after this happened.

    Mr. Sam
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    Default C5 Radio low volume issue resolved

    Mr. Sam,

    The low volume issue was noticed when I originally bought the Vette. The radio was replaced after checking the Bose fuse F28 & the Bose relay, since I had a friend with a spare unit. The actual problem was as you suggested: Fuse 24 was blown for the signal processor in the I/P fuse panel. I found some schematics but it labeled both RDO/CD & RDO/ANT fuses as F5. It's working great now. Hallelujah! Thanks again for the assistance.

  9. #9
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    That's great. I appreciate the feedback on that. I almost forgot about that fuse. I never will again.

  10. #10
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    dadaroo you are my hero. I searched for this topic a year ago when I had this problem and did not find this thread. I am 2nd and 4th owner of a stock 2002 Z06 that now has 257,000 miles. Original owner was a friend and he and all of it's owners have autocrossed it. I had a local Corvette shop who has been brilliant with diagnosing issues on other Corvettes for me and the radio was not responding to any inputs at the time ( a new issue). He said send it our for repair. Well, I found a good used one at a good price and decided to take that path. Put it in the am and no difference. ugh. so back to internet searches for amplifier or whatever when I found this thread. Well, dang if it isn't the 24 fuse !!. Not so simple though. When I pulled the fuse it left one leg behind. well, ok. put another fuse in and RATS, still weak sound. so fiddling around at the fuse the sound kicked on and about blew my ears off !!.There is some issue in the fuse box at fuse 24, but at least I know the source of the problem. THANK YOU, THANK YOU

  11. #11
    Moderator Toms007's Avatar
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    Greendot, I'm sure Dadaroo would be thrilled that his solution helped you with your problem. However we lost dadaroo a few years back now. Just thought you'd like to know.
    2007 Atomic Orange Coupe Cashmere/black interior

    2005 CruiseFest Attendee (Bowling Green, KY) 2007 CruiseFest Attendee (Colorado Springs, CO)
    2008 CruiseFest Attendee (Cleveland, OH)
    2010 Cruisefest Attendee(Effingham, IL)
    2011 CruiseFest Attendee(Effingham
    , IL)

    Formerly owned Corvettes: 1964 coupe, 1994 coupe, 2001 coupe

    Thanks greendot thanked for this post

  12. #12
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    Quote Originally Posted by Toms007 View Post
    Greendot, I'm sure Dadaroo would be thrilled that his solution helped you with your problem. However we lost dadaroo a few years back now. Just thought you'd like to know.
    Sam was a Super Dude and good friend. He is missed,I don't have a pit stop anymore cruzing home from Fla! Sam was a real hoot too, He defiantly called them like he seen'em!
    It's got so it seems to me that the Internet has created a lot more Horses A$$'s than we have Horses!
    junk!~!!
    Founding Member: 10 Corvettes Anonymous

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  13. #13
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    Tom, I appreciate your updating me. It is obvious that Dadaroo was a respected and valuable member of the forum. As you can see from my profile I'm a long time but inactive member. Fortunately Dadaroo's contributions live on. RIP sir.
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