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Old 15 Mar 2006, 03:26 pm
frischesbrot
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Default 2003 Civic ABS/Brake/Airbag Indicators & das light issues

Hello!

My 2003 Honda Civic EX is no longer under warranty- and it is having some
dash, indicator light issues. My ABS and Brake light will occassionally
flicker- sometimes even rapidly, and/or go in and out. THe Airbag light will
come on when I start the car (as it should) then shut off, then turn back on
once I start moving. Also, my dash lights went out once on me last week-
totally shut off- all power out on a moment with no guages reading, then it
came back on within 2 seconds. Any ideas as to what could be going on?
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  #2 (permalink)  
Old 16 Mar 2006, 07:37 am
Michael Pardee
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Default Re: 2003 Civic ABS/Brake/Airbag Indicators & dash light issues

"frischesbrot" <u19717@uwe> wrote in message news:5d4e8f1a198f8@uwe...
> Hello!
>
> My 2003 Honda Civic EX is no longer under warranty- and it is having some
> dash, indicator light issues. My ABS and Brake light will occassionally
> flicker- sometimes even rapidly, and/or go in and out. THe Airbag light
> will
> come on when I start the car (as it should) then shut off, then turn back
> on
> once I start moving. Also, my dash lights went out once on me last week-
> totally shut off- all power out on a moment with no guages reading, then
> it
> came back on within 2 seconds. Any ideas as to what could be going on?


The widespread electrical symptoms suggest you have something wrong in the
main electrical system. That usually means one of three areas: alternator,
battery, or connections (especially ground connections). Are you looking at
a DIY approach or at what to expect when you take it to a shop?

Mike


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  #3 (permalink)  
Old 16 Mar 2006, 01:17 pm
frischesbrot via CarKB.com
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Default Re: 2003 Civic ABS/Brake/Airbag Indicators & dash light issues

Thanks for your reply. I'd like to go DIY- if possible. Let me know what
I'd be up against.

Michael Pardee wrote:
>> Hello!
>>

>[quoted text clipped - 8 lines]
>> it
>> came back on within 2 seconds. Any ideas as to what could be going on?

>
>The widespread electrical symptoms suggest you have something wrong in the
>main electrical system. That usually means one of three areas: alternator,
>battery, or connections (especially ground connections). Are you looking at
>a DIY approach or at what to expect when you take it to a shop?
>
>Mike


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Message posted via http://www.carkb.com
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  #4 (permalink)  
Old 16 Mar 2006, 09:57 pm
Michael Pardee
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Default Re: 2003 Civic ABS/Brake/Airbag Indicators & dash light issues

"frischesbrot via CarKB.com" <u19717@uwe> wrote in message
news:5d5a00ae4378e@uwe...
> Thanks for your reply. I'd like to go DIY- if possible. Let me know what
> I'd be up against.
>


If you have a digital voltmeter you can check a few important things.

With the engine running (since that is when you have the problem) and the
headlights on measure the DC voltage between the engine block - anyplace on
the engine, actually - and the chassis. There should be negligible voltage
between the two. If there is voltage the engine ground is not connected and
that will certainly cause all sorts of weird symptoms.

Also with the engine running, check the DC and AC voltages across the
battery. The DC should be 14 volts +/- about 1/2 volt... higher when the
alternator is cold, lower when it is hot. The AC voltage across the battery
must be less than 0.1 volt. If it is higher - often over a volt AC - either
the battery is seriously bad or the alternator has bad diodes. Replacing the
battery or even connecting another one across the existing one with jumper
cables will tell the difference.

If that doesn't show anything obvious, you are probably going to have to
verify grounds behind the dash and probably under the hood. That is much
more easily done with a Helm manual (about $60 US IIRC from Helm
http://www.helminc.com ) because of their comprehensive wiring information.
The grounds can be checked by measuring (engine running) from one ground
point to any other. If they are the same voltage you need to keep looking.
Maybe the wiring diagram will even point to a ground that is common among
the circuits that are acting up.

Mike


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