Question about 2003 Pontiac Bonneville

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Wiring diagram for 2003 pontiac bonneville

I have started installing a new pioneer deck into my car but it seems i cant find a 2003 wiring diagram and i started to look at the 1999 Bonnevile diagram but is this ok to do?

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  • irishrenegad May 27, 2009

    thats what i figured but i installed all the wires according to the 1999 standards and the damn thing wont turn on. all my wires are covered perfectly and i did everything i was supposed to...i doubt i blew a fuse but idk

  • Richard Scordino May 11, 2010

    They make an adapter harness bridge that plugs into your harness and the harness of the radio. you do not need a diagram if you can obtain one (usually found in electronics stores that sell radios/ installs them.

  • its420_us May 11, 2010

    Chances are the stereo wiring didn't change from 1999 to 2003.


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Posted on Jan 02, 2017

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SOURCE: 1999 Pontiac Bonneville serpentine belt installation.

if you look by the crankshaft pulley to the right you will see a tubular looking shaft about 1" diameter , you will notice you can't get the belt out from under this piece , it has a nut on it , once you take the nut off , you will notice it has a star shaped point on the tip of the stud , it requires a reverse torx socket or wrench to remove the stud , when you get the stud out the tube piece it can be removed , then the belt comes off , replace the belt , now comes the tricky part , fitting that tube spacer back into its spot , it can be difficult , once its in place put the stud back in , and put the nut on and tighten it , your pretty much a pro now . thanks.

Posted on Dec 30, 2008

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SOURCE: 1999 pontiac bonneville ssei supercharged belt routing diagram

This is the one for the supercharger.


Posted on Mar 14, 2009

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SOURCE: 2003 pontiac bonneville wipers wont shut off

There is a TSB (Technical Service Bulletin) for this problem, consult GM for more info. It simply regards the wiper module cover assembly that has been problem atic in most gm vehicles. Your best bet though would be to remove the cover and look for any signs of moisture intrusion, or broken circuts. If you find a broken circut and are handy with a solidering iron, you may be able to fix this problem. If there is any evidence of moisture, you may want to try to dry the unit out and see if that makes any difference. Normally though this problem ends in replacinjg the complete wiper module cover assembly. Here is where that item is located.

Posted on Apr 07, 2009

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SOURCE: 2003 Pontiac Bonneville Interior lights dont work

There is another fuse box under the back seat that has the fuse for the interior lights. I have the same problem. I keep replacing fuses but they keep blowing. I don't know what to do.

Posted on Apr 15, 2009

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SOURCE: need diagram how to install serpitine belt on 1997 pontiac bonneville se 3800

8th digit of your vin# needed. Is it an "L", "C" or "K" ?

Posted on May 26, 2009

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I suggest to check your car model in the right list HERE.

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