Question about 2003 Chevrolet TrailBlazer

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No gps signal allowed when truck on

When i turn on my trailblazer i lose all signal to my gps. i have tried an external antenna but the problem persists.

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  • crap750 Dec 19, 2008

    It works fine outside of the truck.

  • crap750 Dec 19, 2008

    The radio antennae is on the front passenger fender and yes there is an Onstar antennae. but i will try to sit in the back of the truck to see if it works. if it does work in the back does that mean i need a longer cable for the external antennae?

  • crap750 Dec 20, 2008

    That sounds resonable. I'm going to find out ASAP. Thanks I'll reply if it works.

  • crap750 Dec 20, 2008

    I have GPS signal now. I unplugged the antennae but it still didn't work, so i unplugged everything from the Onstar and now my GPS sysem Works.

    I want to thank everyone who helped me solve this problem.

    Lets let eveyone know about this solution



    Thankyou again

  • Mike Butler
    Mike Butler May 11, 2010

    I'm thinking the "Onstar" antennae might be blocking out, or disrupting your GPS signal. Seeing how they are both GPS signals.If your no longer using "Onstar" maybe you can find out where the signal comes in & how to disconnect it to try and see if it helps. maybe even an inquiry to Onstar or GM would give you an idea. I know years ago when I started installing car phones, they always advised us to make sure antennae for phone was at least 3 ft. or 1 mitre, away from Radio antennae for same reason. Maybe even a piece of that metal foil duct tape over the Onstar antennae will tell you what you want to know, and cure your problem, who knows?

  • Mike Butler
    Mike Butler May 11, 2010

    Where's the radio antennae for your truck, outside fender, in windsheild,? Have you tried for a signal, while sitting as far back in the trailblazer as you can, or as far away from radio antennae as you can? No "Onstar" antennae on roof by any chance?

  • Mike Butler
    Mike Butler May 11, 2010

    Weird, what happens when you hold GPS outside of vehicle?

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  • Chevrolet Master
  • 6,674 Answers

One other thing to check would be to see if the Onstar, has it's own fuse by chance & if yes, remove it & try yur GPS after.

Posted on Dec 20, 2008

  • Mike Butler
    Mike Butler Dec 20, 2008

    Thanks for gettin back to us, glad to hear my suspicions were correct & your up & running

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