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Thread: 2007 Jeep Grand Cherokee

  1. #41
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    Quote Originally Posted by TheSovereign View Post
    I'm using a Scosche DCC03SRB harness to integrate with the stock speakers.... kinda sounds a bit crappy, like all audio frequencies are being sent to all speakers, perhaps?
    You are correct. The harness doesn't act as a crossover, so either your headunit / computer needs to seperate frequencies for different speakesr, you need to use component speakers with a crossover, or you need to use the crossover feature of your amplifier if it has one. If you have the "premium" boston accoustics upgrade on the Grand Cherokee, then I beleive the amp has bult-in crossover settings due to the seperate types of speakers used in that system.

    Also, it seems that the TPMS system is indicating a fault ever since I implemented the harness... Is it possible that removal of the stock radio could be causing this? (CAN bus)
    Ahhhh... welcome to the TPMS system of the Grand Cherokee -- and this is normal. The TPMS system of the Grand Cherokee's is one of the buggiest out there. Search google and you'll see, and I deal with this as well on our 2007.

    Either you really do have low pressure in a tire (also check your spare)... or, more then likely the temperature has been fluctuating outside. The TPMS system doesn't cope with temperature changes too well -- especially when it's warm during the day and drops cold at night, then warms back up again.

    It'll be fine some days, and give a fault some other days.. When the temperature outside begins to stabilitize (like summar and winter), then it'll go away. =)

  2. #42
    Low Bitrate TheSovereign's Avatar
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    Quote Originally Posted by NotYou View Post
    You are correct. The harness doesn't act as a crossover, so either your headunit / computer needs to seperate frequencies for different speakesr, you need to use component speakers with a crossover, or you need to use the crossover feature of your amplifier if it has one. If you have the "premium" boston accoustics upgrade on the Grand Cherokee, then I beleive the amp has bult-in crossover settings due to the seperate types of speakers used in that system.
    Aaaaaaahcrap. My amp doesn't have a crossover. I don't have the premium audio system. I was afraid I was going to wind up having to replace speakers.

    Aaaaaahcrapp.


    Quote Originally Posted by NotYou View Post
    Ahhhh... welcome to the TPMS system of the Grand Cherokee -- and this is normal. The TPMS system of the Grand Cherokee's is one of the buggiest out there. Search google and you'll see, and I deal with this as well on our 2007.

    Either you really do have low pressure in a tire (also check your spare)... or, more then likely the temperature has been fluctuating outside. The TPMS system doesn't cope with temperature changes too well -- especially when it's warm during the day and drops cold at night, then warms back up again.

    It'll be fine some days, and give a fault some other days.. When the temperature outside begins to stabilitize (like summar and winter), then it'll go away. =)
    I didn't check the pressure in the spare, but I don't think it's a low pressure issue. When pressure is low, the idiot light comes on and stays on solid until you figure out which tire is low, and fill it up. I've been through that. What it's doing is periodically coming on, with a warning chime, and then it keeps blinking. If I recall correctly, the manual says this is indicative of a problem with the TPMS system itself. Next time I pick up the manual, I'm going to figure out which fuse is for the TPMS and pull that b!tsh. Hopefully.

    Seriously I'd rather not have TPMS than a system that can't tell me wtf is wrong.

  3. #43
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    Quote Originally Posted by TheSovereign View Post
    Aaaaaaahcrap. My amp doesn't have a crossover. I don't have the premium audio system. I was afraid I was going to wind up having to replace speakers.

    Aaaaaahcrapp.
    Yea, then you have the full signal going to each speaker. Not sure exactly what type of setup you are going for, but you can either create your own crossover (or more accuratly a filteR), or buy one off of ebay or something similar.


    I didn't check the pressure in the spare, but I don't think it's a low pressure issue. When pressure is low, the idiot light comes on and stays on solid until you figure out which tire is low, and fill it up. I've been through that. What it's doing is periodically coming on, with a warning chime, and then it keeps blinking. If I recall correctly, the manual says this is indicative of a problem with the TPMS system itself. Next time I pick up the manual, I'm going to figure out which fuse is for the TPMS and pull that b!tsh. Hopefully.

    Seriously I'd rather not have TPMS than a system that can't tell me wtf is wrong. [/QUOTE]

    Hehhe.. what ours does is come on when the Jeep is started, gives the warning chime, and then just stays on solid. It'll stay like this until the Jeep is turned off. Then, when turned back on it's a 50/50 shot of the same thing happening again. Seriously, though.. this is one of the first things that Jeep has put on their vehicles that is such a pile of cr*p.

    We're at the point that even if there WAS a tire with low pressure, I wouldn't beleive it or I would have ignored the warning from the TPMS because of so many false positives =)

  4. #44
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    Quote Originally Posted by NotYou View Post
    Yea, then you have the full signal going to each speaker. Not sure exactly what type of setup you are going for, but you can either create your own crossover (or more accuratly a filteR), or buy one off of ebay or something similar.
    How are you planning on implementing the audio portion of your install? Do you have the premium audio system with the separate amplifier?


    Quote Originally Posted by NotYou View Post
    Hehhe.. what ours does is come on when the Jeep is started, gives the warning chime, and then just stays on solid. It'll stay like this until the Jeep is turned off. Then, when turned back on it's a 50/50 shot of the same thing happening again. Seriously, though.. this is one of the first things that Jeep has put on their vehicles that is such a pile of cr*p.

    We're at the point that even if there WAS a tire with low pressure, I wouldn't beleive it or I would have ignored the warning from the TPMS because of so many false positives =)
    I hear you. I think I'm going to go flip through that manual to find that fuse now.

  5. #45
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    Quote Originally Posted by TheSovereign View Post
    How are you planning on implementing the audio portion of your install? Do you have the premium audio system with the separate amplifier?
    I REALLY should sit down and start an install thread, seams like a right of passage here.. =)

    I've got the 'premium' Boston accoustics sytem.. Not what I would call 'premium' to be honest, but it's actually not to bad for something from the factory.

    I had to pickup the Metra CHTO-01 interface, which ran about $90 after shipping. This will allow me to use the factory amp, and overcome two limitations -- the amp itself is actually turned on by CAN bus signals, and there is no 12v accesory wire easily located. The CHTO-01 gave me both, and is similar to your harness just designed for the premium system. $90 is a little high IMO, but cheaper then investing in a new amplifier -- and the wife won't notice much difference I think.

    Do you have 4 or 6 speakers? I couldn't find anything that said how many speakers the non-premium system has. The premium system has 6, and uses its 'DSP' to act as a crossover for the front woofers and tweeters.

  6. #46
    Low Bitrate TheSovereign's Avatar
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    Quote Originally Posted by NotYou View Post
    I REALLY should sit down and start an install thread, seams like a right of passage here.. =)

    I've got the 'premium' Boston accoustics sytem.. Not what I would call 'premium' to be honest, but it's actually not to bad for something from the factory.

    I had to pickup the Metra CHTO-01 interface, which ran about $90 after shipping. This will allow me to use the factory amp, and overcome two limitations -- the amp itself is actually turned on by CAN bus signals, and there is no 12v accesory wire easily located. The CHTO-01 gave me both, and is similar to your harness just designed for the premium system. $90 is a little high IMO, but cheaper then investing in a new amplifier -- and the wife won't notice much difference I think.
    Gotcha. It sounds like your implementation will be a little easier than mine then.... Good Luck!


    Quote Originally Posted by NotYou View Post
    Do you have 4 or 6 speakers? I couldn't find anything that said how many speakers the non-premium system has. The premium system has 6, and uses its 'DSP' to act as a crossover for the front woofers and tweeters.
    6 speakers as well: two small speakers in the dash, and one speaker per door.


    Now the Scosche harness only provides four "inputs:" Front-Left, Front-Right, Rear-Left, and Rear-Right... no distinction for tweeters or woofers... there's just no way I'm going to be able to get decent sound without buying "filtered" speakers, is there? (or at least an "easy" way, without dismantling dash and door panels... lol)

  7. #47
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    Quote Originally Posted by TheSovereign View Post
    Gotcha. It sounds like your implementation will be a little easier than mine then.... Good Luck!


    6 speakers as well: two small speakers in the dash, and one speaker per door.


    Now the Scosche harness only provides four "inputs:" Front-Left, Front-Right, Rear-Left, and Rear-Right... no distinction for tweeters or woofers... there's just no way I'm going to be able to get decent sound without buying "filtered" speakers, is there? (or at least an "easy" way, without dismantling dash and door panels... lol)
    You can add an EQ like the one I have. This will split the highs, mids and lows and send them to the correct amplifier. One being the on you installed behind your screen for highs and mids to the OEM speakers.

    Maybe we can throw in the Pheonix Gold amp and bass tube this weekend?

  8. #48
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    Quote Originally Posted by TheSovereign View Post
    6 speakers as well: two small speakers in the dash, and one speaker per door.

    Now the Scosche harness only provides four "inputs:" Front-Left, Front-Right, Rear-Left, and Rear-Right... no distinction for tweeters or woofers... there's just no way I'm going to be able to get decent sound without buying "filtered" speakers, is there? (or at least an "easy" way, without dismantling dash and door panels... lol)
    Hmm.. interesting, I thought the Grand Cherokee's without the premium audio system only had four speakers. You sure it doesn't say "Boston" on the little nameplate in front of the speakers on the doors? Or - with the factory audio system - do you have sound coming out of the Instrument Panel (dash) speakers? Are there really speakers in the dash, or does it just look like it? Not doubting you, just trying to figure out how to help ya.

    Ya know.. I just thought of something. Can you describe the audio path you have setup? Basically, describe the cables and connection path that exists from the computer to the speakers.

    I just took a quick look through your thread again, and I don't remember seeing an amplifier for your speakers. If that's the case... then most likely the reason it doesn't sound that great is your missing something to power the speakers. The non-premium system uses the amplifier in the headunit to power the speakesr... and if you don't have one then the speakers are not getting an amplifier signal (which they need to work effeciently)

  9. #49
    Low Bitrate TheSovereign's Avatar
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    Thanks for the suggestions guys... it turns out the craptastic audio was caused by a bug in an older version of Centrafuse (RC1). Running RC3 now, but when I upgraded to RC2 the problem cleared right up. =)

    As far as the amp situation is concerned, since there is no stock amplifier, I buried a small 4-channel 200w in my dash to drive the stock speakers.

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    I thought my speakers and amp went bad too! Thanks Sovereign!

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