Question about 2003 Toyota Tundra

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2003 Toyota Tundra goes dead

My truck goes dead chronically, I replaced the battery last year. After three months the truck started going dead. I think it might be a short that is slowly draining the battery causing the battery to eventually die?

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  • jimswitzer
    jimswitzer Apr 11, 2012

    Yes I went nuts with the dead battery problem till I found TSB_EL015-03. Seems the frist half of the production year 2003 Tundra has a problem with the tow package relay being left energized if you leave the lights in the daytime running position so that they turn off by opening the door, it will run the battery down.
    Toyota knows this, won't do a recall, but there is a kit you can get that is listed in the Technical Service Bulletin EL015-3. When it tell you to use a special tool to remove a pin from the large connector (red) don't bother, you will never get it out. Just cut the red wire and use a crimp tool to splice it to the kit's wire. There is no room to work it, just cut it and splice it.http://www.toyotanation.com/forum/123-tr...

  • Thomas Russ May 04, 2013

    Got my instruction faxed to me on the relay fix... Oh my frickin criipe !! That\'s a days work ! I am just going to pull my relay out..... For sure it was that because I turned the car off, pulled out the keys, opened the door and the headlights went off.... Tow-tail relay remained powered forever !!! Pulled it out ! Wonder what that will do to me? I will never use the tow harness.....

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Have Battery tested for a bad cell

Posted on Dec 12, 2009

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Yes I went nuts with the dead battery problem till I found TSB_EL015-03. Seems the frist half of the production year 2003 Tundra has a problem with the tow package relay being left energized if you leave the lights in the daytime running position so that they turn off by opening the door, it will run the battery down.
Toyota knows this, won't do a recall, but there is a kit you can get that is listed in the Technical Service Bulletin EL015-3. When it tell you to use a special tool to remove a pin from the large connector (red) don't bother, you will never get it out. Just cut the red wire and use a crimp tool to splice it to the kit's wire. There is no room to work it, just cut it and splice it.
http://www.toyotanation.com/forum/123-truck-archive/74107-2003-battery-draining.html

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