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My new head unit won't work

I have a 1997 pontiac sunfire. I bought a Kenwood MP538U head unit and i installed it today. All the wiring seems to be correct the fuses are not blown and the battery is connected. I hooked up the head unit and it won't even light up. We put in the old radio and now that one doesn't even light up. I thought it could be the theftlock thing on the radio but it would at least illuminate and say something would it not?

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  • brendan816 Jun 20, 2008

    could it be any other problem besides a blown fuse? we replaced both of them and it still doesn't work somewhere along the lines. Why didn't I just let Best Buy install it! haha

  • brendan816 Jun 20, 2008

    i got a harness that plugs into the factory harness. The interior lamp doesn't work but that's because we took out the fuse since it didn't turn off if we left the door open and we tried to put new fuses back in but they blew every time. But yeah, i got a harness adapter.

  • brendan816 Jun 21, 2008

    alright so you were correct we had a bunch of blown fuses haha

  • johnny rainer Dec 05, 2008


  • Nicki414 May 02, 2009

    I have a 99 pontiac grand am. I had a factory cassette player in it that I switched out to my b/f's. I finally got my own (alpine) and installed it today it simply wont turn on at all. I checked the wiring and it is correct and tightly secured. I also checked all the fuses under the hood and in the car everything looked fine. My b/f is convinced that fuses dont have to break to be blown so now I cant tell cause I was taught that they break thats how you tell. Everything else in the car works fine but I cant for the life of me figure out what the issue is. HELP PLEASE!!!! Also I did take the alpine back out and reconnect the unit that was previously working moments prior and it also is not responsive now....sheesh why does best buy have to charge so much for little tasks like this....any help would be appreciated


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My thought is that there is a fuse blown. If you put the factory back in and that didn't light up then there is definately a fuse blown. Correct me if I'm wrong but guessing that you didn't cut the harness, by the fact that you could put the factory unit back in, you probaby don't have a problem with wiring. Aslong as you matched up wiring colors with the harnesses the wires should be fine. The next problem should be a fuse. Not all fuses blown in a way that is easy to see. Just replace the "radio" fuse in your fuse panel and give that a shot. If you still have problems get back to me. Good Luck!
-Andrew Hawkins

Posted on Jun 20, 2008

  • 1 more comment 
  • Andrew Hawkins
    Andrew Hawkins Jun 20, 2008

    Best Buy! HAHAHAHAHA!!! Did you cut the harness? or did you get a harness that plugs into the factory harness? Are there any accessories that also don't work or is it just the radio?

  • Andrew Hawkins
    Andrew Hawkins Jun 20, 2008

    Ok, you took out the factory head unit, then plugged in the Kenwood, it didn't work so you tried the factory one to see if that one works and it didn't I hate to ask but did the factory headunit work before you took it out? If it did then check ALL fuses, even check the ones under the hood. CHECK THEM ALL. If the factory one worked before and now it doesn't then it is either a fuse or a cut wire somewhere. Good Luck

    -Andrew Hawkins

  • Andrew Hawkins
    Andrew Hawkins Jun 23, 2008

    Good! I knew it! I'm glad I could help. Let me know if you need any help in the future.

    -Andrew Hawkins


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