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Thread: 1998 Jeep Grand Cherokee audio help PAleeezz

  1. #1
    Constant Bitrate
    Join Date
    Feb 2008

    1998 Jeep Grand Cherokee audio help PAleeezz

    My buddy just got a new Nice pioneer head unit for his 1998 Jeep Grand Cherokee.

    I figured it would be an easy straight up *wire it up and put it in* installation like my car pc in my 01 Rodeo.

    Well, it didn't go that way.

    I CANNOT get audio to pass through the speaker wires down to the speakers on ANY channel. Literally, nothing. So I figured there is probably a factory amp somewhere.

    Reading around on the forums, I have come to find out if you have the Infinity audio in your Jeep, the amp is installed under the back seat. Looked everywhere- ITS NOT THERE. The jeep has no infinity stickers or badges anywhere. The stock head-unit worked perfectly fine with audio.

    There has got to be a built in factory amp hiding somewhere that I jsut can't figure out how to turn on. We just want to bypass it all-together and get everything working.

    thanks for any input!

  2. #2
    Variable Bitrate
    Join Date
    Jun 2004
    I have taken a look at the radio wiring diagrams I have for the 98 Jeep Grand Cherokee. It looks like there were 3 systems available: base, limited, and premium. The base model has no external amps. The limited and premium use an external amplifier, but the amp powers all of the speakers, not just the rears. It is possible these diagrams are incorrect, though. Let me know if you want to take a look at these.

    Sometimes the factory amps sit right on the back of the indivual speakers - you might check there.

    If the optional system was infinity, I do know that the factory infinity systems for Chrysler and others tended to have external amps just for the rears. In this case, it was usually simple to fire up the factory amp. If you are using a wiring harness adapter, the blue wire, sometimes labeled "Power Antenna", will often signal the amplifier to turn on. Just connect this to the "remote" output of your head unit (again, usually a blue wire) and you are on your way.

    Now whether the factory amp takes high or low level inputs is another question.

    Hope this helps.
    ** Denotes an "in car" post
    In-Car posts made from passenger seat - Be safe, Don't Post and Drive.

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