Check first Fuse 28 and Relay 45.
03Z Door Subs Not Working
Thread Starter
8th Gear
Joined: Sep 2020
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From: Warner Robins, GA
03Z Door Subs Not Working
I just bought a 2003 Z06, but the door subs don't appear to be working. All the other speakers work (front and back), though. I'm guessing there's a fuse or module that has failed. Could someone give me a troubleshooting list of possibilities? I want to keep the system stock, if at all possible. Any help you could provide would be greatly appreciated!
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From: Iowa
St. Jude Donor '03 thru '26
Do you still have the stock head unit or is it aftermarket? By your description it appears you have stock head unit but I want to be sure before we troubleshoot your problem. 
Thread Starter
8th Gear
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From: Warner Robins, GA
You are correct. I have the stock HU with the stock Bose package. Thanks so much for your assistance!
Race Director
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From: Iowa
St. Jude Donor '03 thru '26
Man, I can't believe no one has a response.
Anyhow, without running out to my detached garage in the rain to verify, I would check fuse #28 and #45 in the interior fuse box (located under the passengers side floor mat. There is also a panel to remove). I believe that is the fuse for the subwoofers as the subwoofers have their own amplifiers.
Anyhow, without running out to my detached garage in the rain to verify, I would check fuse #28 and #45 in the interior fuse box (located under the passengers side floor mat. There is also a panel to remove). I believe that is the fuse for the subwoofers as the subwoofers have their own amplifiers.
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Thread Starter
8th Gear
Joined: Sep 2020
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From: Warner Robins, GA
OK. It's apparently not the fuses. Just for fun, while I had Fuse 28 removed, I powered on the radio and quickly discovered the door speakers were indeed working - they just sound terrible! I guess I'll be saving up for a new system all the way around now. Thanks so much for all the input!
Melting Slicks
Joined: Jan 2009
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From: Miami FL
Sound quality definitely can be substantially upgraded, but I suggest you fix the problem with the door subwoofers first. For some upgrade ideas take a look at this Post
Last edited by GCG; Sep 14, 2020 at 10:22 PM.
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St. Jude Donor '03 thru '26
I'm amazed at how decent the factory Blose 
system CAN sound with the addition of a subwoofer and a set of tweeters. My black 99 still has the entire stock system but I added a set of JL Audio tweeters up in the A-pillars and also added a amplifier to power two 12" RF subwoofers. Though not cheap, it really woke up the stock system. I have all the bass I could ever need and the tweeters up in the A-pillars really brings the sound stage forward. They add the treble the stock system lacks. Now I have to work on my red 99's audio system 
system CAN sound with the addition of a subwoofer and a set of tweeters. My black 99 still has the entire stock system but I added a set of JL Audio tweeters up in the A-pillars and also added a amplifier to power two 12" RF subwoofers. Though not cheap, it really woke up the stock system. I have all the bass I could ever need and the tweeters up in the A-pillars really brings the sound stage forward. They add the treble the stock system lacks. Now I have to work on my red 99's audio system
Thread Starter
8th Gear
Joined: Sep 2020
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From: Warner Robins, GA
Correct. I thought the door subs weren't working before I removed the fuse. When I removed the fuse, I discovered they were working, they just sounded so terrible I thought they weren't working. The sound from the doors lacks any real bass or low-mid at all - that's why I thought the subs weren't working. Hope that clarifies...