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Old 2nd May 2013, 12:16 AM   #1
diyAudio Member
Join Date: May 2013
Default Radio shuts off when light are turned on

I recently put in an aftermarket radio into my '94 Toyota. The radio works fine, that is, unless I turn on the dash or headlights. I have subs hooked in my car and they still emit the bass from the song that is playing, but my speakers don't output any sound (lyrics and such).
Any help would be great, and thanks in advance!
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Old 2nd May 2013, 02:16 AM   #2
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Join Date: Nov 2005
Location: San Antonio
Doesn't seem like it would be excessive draw from the electrical system, so my first guess would be wiring error. Are the mids driven by the head unit or from a dedicated amp?
It is error only, and not truth, that shrinks from enquiry. - Thomas Paine

Last edited by sofaspud; 2nd May 2013 at 02:18 AM.
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Old 2nd May 2013, 03:40 AM   #3
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Location: Washington State
Most units have a orange wire(s) for a dimmer check those to see if they are hooked up and shouldn't be.
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Old 2nd May 2013, 03:42 AM   #4
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I'll check these things tomorrow after work. Thanks
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Old 2nd May 2013, 07:30 PM   #5
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Location: Stewartsville, NJ
The dimmer wire is connected as the ground. It will show ground when the lights are off as it picks it up through the light bulbs. Find a proper ground.
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Old 4th May 2013, 10:42 PM   #6
speye is offline speye  Jamaica
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u have the ground wire of the radio on the dimming cct. of the car....
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Old 11th May 2013, 05:53 AM   #7
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He said the subs still play.... which suggests the ground isn't connected to the illumination circuit.
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Old 11th May 2013, 01:25 PM   #8
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Join Date: Aug 2011
Sounds like HU earth is connected to illumination.
Which Toyota-some have separate amps fitted?
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Old 11th May 2013, 02:11 PM   #9
FoMoCo is offline FoMoCo  United States
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Join Date: Dec 2012
A quick check to rule out the vehicles electrical system: Measure battery voltage (right at the terminals) with and without headlights.
It'd also be good to do the same at the head unit to help diagnose wiring errors.
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