"Brake" light and "Battery" light on.
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This is a discussion on "Brake" light and "Battery" light on. within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hello all. I have an 05 WRX and both of said lights are on. I just replaced my battery that ...

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    "Brake" light and "Battery" light on.

    Hello all.

    I have an 05 WRX and both of said lights are on. I just replaced my battery that did not change anything. I also checked my fluids and did a visual inspection of my brakes and everything seemed peachy. Anyone have any idea on what's up?

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    The Member michaelwfox's Avatar
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    Pull the negative cable from the battery for 5-10 minutes. When you reconnect it the ECU should have reset. If it doesn't then there might be another problem, which I have no idea about.
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    He simply abides. SD_GR's Avatar
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    It's a charging problem. Suspect alternator.
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    Man is a brute.... If you're cruel to him, he respects and fears you. If you're kind to him, he plucks your eyes out. Alexis Zorbas
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    Registered User Ingo's Avatar
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    Check voltage at battery with engine off and engine running. Should get up to 14.5 volts with engine running. Engine off = 12.5 to 13.5 V (for a charged battery) If voltage is not higher when engine is running you will have to check the alternator/regulator (part of the alternator, usually).
    You can't have everything - where would you put it?

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    Alright Ingo, I'll check the voltage tomorrow and post results. Thanks for the quick replys.

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    "Brake" light and "Battery" light on.

    Ok does any one have any input?

    I replaced my battery and replaced the alternator...still have both my "brake and battery" lights still on...any idea?

  8. #7
    He simply abides. SD_GR's Avatar
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    I'd still suspect charging problem. Check voltage (carefully!) across battery terminals with car off vs. car running. Check (carefully!) all harnesses to battery and alternator. All this assumes a good belt and no pulley or tensioner problems.
    WRX Info Links, Courtesy TheJ
    Man is a brute.... If you're cruel to him, he respects and fears you. If you're kind to him, he plucks your eyes out. Alexis Zorbas
    I lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
    DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

  9. #8
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    "Brake" light and "Battery" light on.

    Checked voltage with DMM with car off I was at 12.65 with car on I was at 14.04.

    Car has new battery and alternator...any ideas?

  10. #9
    Registered User Ingo's Avatar
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    I just went and checked mine for comparison: Voltage with engine running was 14.75 (engine cold @1500-2000rpm), after shut down it was reading 12.9 and slowly dropping. I did not get a reading before starting because sitting against the wall and had to back up to get under the hood. Bottom line, your charging voltage looks still low. I had a problem once with my BMW motorbike: the ABS light would stay blinking with no other indication of a problem, other than weak starting, was a bad battery. The ABS electronics turned out to be VERY sensitive to low batt. Maybe the subie is like that, don't really know if so. Anyways, again, your batt volt seems fine, charging seems low. The numbers above are from my 2009 WRX.
    You can't have everything - where would you put it?

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