car radio powers up but no sound

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jasperjodo

Member - Posts: 3

Joined: August 25, 2009

Posted: August 25, 2009 at 12:13 PM / IP Logged

Hello

Friend's 1990 Geo Metro, 2 dr hatchback, Canada

factory 4 speaker system

Aftermarket cassette/radio powers up but delivers no sound. Owner claims radio stopped working after high school mechanics' class changed her brakes (5 yrs ago). I offered to look at it. Retrieved Chilton book from Library to review wiring diagram. Radio seems to be hooked up correctly. I swapped her radio out with an old one I had (also a cassette player / radio) and wired mine to the correct speakers etc. and it did the same thing.

I own a Fluke DMM multitester and checked the radio's 1 amp fuse (good). Car fuses also okay in the fuse box.

I removed, cleaned (although it did not seem to need it), and reattached the chasis ground from the battery.

I am losing sleep over this one. Can anyone help?

Thanks!

Jasper

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DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: August 25, 2009 at 12:44 PM / IP Logged

Check continuity from the head unit to the speakers, and check to make sure a speaker or speaker wire is not shorted or shorted to ground.

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jasperjodo

Member - Posts: 3

Joined: August 25, 2009

Posted: August 25, 2009 at 1:17 PM / IP Logged

Thanks for your response.

Any chance you'd want to explain how I do those steps? I'd hate to think I'm doing it correctly when if fact I may not be... I'd really like to fix this for her because I'll score big points if I do!

Thanks again

Jasper

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DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: August 25, 2009 at 2:09 PM / IP Logged

You need an ohm meter, and maybe some long leads. Disconnect the speaker wires from the head unit. Pull the speakers out of the doors and check the speaker wires point to point for continuity - each wire should read less than one ohm usually. Then check positive to negative with everything unhooked and it should read open loop. While you're there, check resistance to ground. It should be an open loop from each wire to chassis ground. Also check the DC resistance of the speakers. They should be greater than 1.5 ohms, usually, and less than 4 ohms for 4-ohm speakers. You'll need to do this at each speaker. Any of them shorting positive to negative or shorting to ground will cause the head unit to shut off the output amplifiers.

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jasperjodo

Member - Posts: 3

Joined: August 25, 2009

Posted: August 25, 2009 at 2:37 PM / IP Logged

Thanks for the explanation. I will check this out and post back results tomorrow.

Jasper

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car radio powers up but no sound

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