Question about 2003 Chevrolet Impala

3 Answers

My chevy Impala LS is having electrical issues. the shift display on my dish stays lit, including the e-break indication if I use the E-break. My traction control kicks on when I first put my car into drive for no reason, when I use the button to lock my car the driver side front door unlocks itself. Now my battery drained over night and I can't get it to take a charge. I have just recently installed two ten inch subs in my back, I don't believe that would cause the dash shift indications to stay lit

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  • Donald Burlage Aug 07, 2010

    My chevy Impala LS is having electrical issues. the shift display on my dish stays lit, including the e-break indication if I use the E-break, After I turn off my car and turn off the lights. My traction control kicks on when I first put my car into drive for no reason, when I use the button to lock my car, It works but then the driver side front door unlocks itself. I have asked other and they told me to check the fuse for the lock, I can not find the location for this fuse. Now my battery drained over night and I can't get it to take a charge. I have unplugged my review mirror because I was also told this could drain the battery.

  • Donald Burlage Aug 07, 2010

    My chevy Impala LS is having electrical issues. the shift display on my dish stays lit, including the e-break indication if I use the E-break. My traction control kicks on when I first put my car into drive for no reason, when I use the button to lock my car the doors lock but then the driver side front door unlocks itself. Now my battery drained over night and I can't get it to take a charge. I have just recently installed two ten inch subs in my back, I don't believe that would cause the dash shift indications to stay lit. But I do have a wire coming from my fuse panel to my amplifier connected into the spot for PCM/BCM/CLSTR

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  • Master
  • 11,896 Answers

Yes it does sound like you are having an electrical issue, possibly with the pcm. Signals are being distroted between tranny and dash. Testing with a meter or running engine codes wouldn't be a bad idea. I would start with pcm

Posted on Aug 07, 2010

  • 5 more comments 
  • Donald Burlage Aug 07, 2010

    Right now I'm trying to jump my car to get some power in there so I can start taking measurements. after I do that I can start checking some things, its just strange that my subs could have done this, I've had them wired that way for a few years now. I did just change my amplifier maybe its too strong?

  • Nate Stansfield
    Nate Stansfield Aug 07, 2010

    If the amp is turned up it could draw to much power from that fuse and blow the circuits.
    It is weird that it would just happen
    I hook up all my amp wiring directly to my cd player wiring. Except for when I use monster cable then I go direct to battery. Cig lighter wire works too.


  • Donald Burlage Aug 07, 2010

    I took this to circuit city way back in the day and that is how they did it. Like I said I just recently upgraded my amp and left all the original wiring, never thought to check their work since I've never had a problem. I just started getting into the whole do it myself thing. hopefully I can get this problem fixed.

  • Nate Stansfield
    Nate Stansfield Aug 07, 2010

    I agree. If the amp is bigger, it may be sucking all the power from the pcm. I would not use that fuse. Hopefully the circuit isn't blown or shorted because it is not cheap to replace. You can however test all the signals from the pcm to each component.

  • Donald Burlage Aug 07, 2010

    How would I go about doing that?

  • Nate Stansfield
    Nate Stansfield Aug 07, 2010

    the best thing to do is buy a $12 repair manual so you know what wires are what from pcm. Napa auto value have them.
    You will need a voltmeter and gain access to your pcm and test each signal coming from pcm.


  • Nate Stansfield
    Nate Stansfield Aug 07, 2010

    Even for me, a mechanic for 10 years, we have to use a manual for the wiring schematic and test each pinout reading from pcm and each circuit to see what should be on and what shouldn't be on.

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  • Chevrolet Master
  • 2,030 Answers

Yes it could have caused your problem.

You have most likely tapped into a line which is either coming or going from the ECM or BCM....this is casuing the wrong signals and implulses to get to the control circuits.

Outside posibility also is that your amps are drawing more power than the car can supply and your are actually beginning to fry the ECM and/or BCM by not allowing it to get the voltage and amperage it needs.

My suggestion get it to a qualified mechanic ASAP before you damage more that can get very costly.

Posted on Aug 07, 2010

  • 1 more comment 
  • Donald Burlage Aug 07, 2010

    I did put a cable with a fuse attached to the system into the PCM/BCM/CLSTR. I have that going to my amplifier, would that have been a problem?

  • Sean Wright
    Sean Wright Aug 07, 2010

    That very well could be the problem....you should never use anything related to the PCM or BCM



    Hope if you take that out all is ok and you havent fried something by hooking to that terminal...that is a NEVER DO THING...and can result in major issues.

  • Donald Burlage Aug 07, 2010

    I have disconnected it. and will never go back to that company again for anything involving my car. Thank you for the help.

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  • Expert
  • 286 Answers

The door lock fuse is probably blown and will need to be replaced. Since this door lock fuse is not working properly it will cause the battery to drain because interior lights will not extinguish properly. This can also make your antitheft security lights come on and prevent you from starting the car at times. If the fuse is blown, replacing it should at least temporarily solve your issue. The shift indicator may be from bumping an overdrive button that toggles off the overdrive. Check for that after the car is running by activating the overdrive lockout button.

Posted on Aug 07, 2010

  • Donald Burlage Aug 07, 2010

    its not a shift indication, the indicators showing the different positions for my shifter to go into doesn't extinguish when I turn the car off. Please do you know where the location of the fuse for the locks? and if that was an issue would it lock when I hit the button but then unlock only the driver side door? Thank you for your help

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