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No Subwoofer


andyb5

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At my wits end here, hoping you guys can help me out.

I have a subwoofer that recently stopped playing. Other than no subwoofer, the head unit (Pioneer AVIC F700BT) functions normally. The problem is constant regardless of the input audio source - radio, CD, USB, or iPod.

So I went ahead and started troubleshooting from the back of the car forwards. The sub isn't blown (measured ohms with DMM) and I checked the speaker wire from the amp to the sub for continuity, all good.

Next, I verified there weren't any breaks or internal faults in my RCA cables and everything there is fine. So my conclusion was that the head unit is not outputting a signal for the sub. Even with a DMM on the RCA outputs on the HU, there is no signal to be found.

So after so searching online, I checked for breaks in the RCA shielding inside the Pioneer unit by following these instructions - http://bcae1.com/images/rca/temporaryrcashieldrepair.html and the shields are ok. And that's where I'm at.

Help please!!

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Amp is getting ~14.4 volts, and the ground is solid. No blown fuses anywhere either.

I ordered a spare harness so I can test the system with an older Pioneer headunit I have.

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hmm....any chance you could swap the amp out to test? is there absolutely no sound coming out of the sub? you said theres a signal from the hu through to the rca's, and that the speakers itself works, so that has me thinking it may be the amp.

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