Question about Car Audio & Video

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I am installing a JVC KW-XC77 stereo on my 2004 trailblazer. I am following this wire diagram http://www.installdr.com/Harnesses/GM-Wiring.pdf . I don't see the gray headlight dimmer light wire on the dash, I still have the orange wire from my stereo left by itself. I connected all speakers and the yellow battery wire and red ignition wires from my stereo to the two orange wires from the dash and the stereo doesn't turn on. I wonder why they have the same orange colors. What am I doing wrong? Thanks. Ray

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  • muzquiz_port Sep 06, 2010

    I checked the fuses and are ok. I pushed the power button and doesn't work, i press the cd ejector and powers on for a second and then turns off again. I think it is not getting enough power. What do you think the problem is?
    I am still confused with leaving the orange wire color from my JVC left hanging. What about the red and yellow wire colors from my JVC connected to the two orange wire colors from the dash. It is a difference of power even though they are the same color?

  • muzquiz_port Sep 06, 2010

    I checked the fuses and are ok. I pushed the power button and doesn't work, i press the cd ejector and powers on for a second and then turns off again. I think it is not getting enough power. What do you think the problem is? I am still confused with leaving the orange wire color from my JVC left hanging. What about the red and yellow wire colors from my JVC connected to the two orange wire colors from the dash. It is a difference of power even though they are the same color?

  • muzquiz_port Sep 06, 2010

    I am installing a JVC KW-XC77 stereo on my 2004 trailblazer. I am following this wire diagramhttp://www.installdr.com/Harnesses/GM-Wi... . I don't see the gray headlight dimmer light wire on the dash that needs to be connected to the JVC's orange wire, I still have the orange wire from my stereo left by itself because I don't have any more wires coming out of the dash. THE STEREO POWERS ON ONLY WHEN I PRESS THE CD EJECTOR FOR FEW SECONDS AND IT TURNS OFF. In my diagram says that the JVC's orange wire should be connected to illumination or a small lamp terminal.Where can I find a terminal close to my stereo where I can connect the orange wire?
    I connected all speakers and the yellow battery wire and red ignition wires from my stereo to the two orange wires from the dash, But still not enough power to turn it on. I wonder why they have the same orange colors. What am I doing wrong? Thanks. Ray

  • muzquiz_port Sep 06, 2010

    I am installing a JVC KW-XC77 stereo on my 2004 trailblazer. I am following this wire diagramhttp://www.installdr.com/Harnesses/GM-Wi... .
    I connected all the speakers with no problem at all, but now I don't find the gray headlight dimmer light wire on the dash to connect to the JVC's orange wire.I connected the JVC's yellow and red wires to the two orange wires coming out from the dash,I wonder why they have the same orange colors and if it would make a difference if connect any of the dashboard's orange wires to the JVC's red or yellow wire.
    I still have the orange wire from my stereo left by itself. Is that the reason why the stereo turns on for a few seconds and then turns off?. Do I have to connect the JVC's orange cable to illumination or small lamp terminal or just leave it alone? If so, where can i find a good terminal for the JVC's orange wire since I don't find a mate for it on the dashboard. What am I doing wrong? Thanks. Ray

  • muzquiz_port Sep 07, 2010

    Thanks for the info. It was really helpful.

    I did test the JVC stereo with a cable from battery and ground, and it works fine. But the cables that are on the dashboard are not giving the stereo power. I checked the fuses and are ok. I visited a local car audio store, and told me it was a unit that controls the Onstar system that was also connected to the original radio. The unit is located underneath the back seat attached to the fuse box of my 2004 trailblazer that needed to be replaced along with other cables and stuff. But to be honest, they sounded like they just wanted me to buy a whole lot of stuff that it would be nice to have but not really necessary. I told them that I just needed to find the power, because speakers, ground and antena are already connected. They told me that it could be bypassed, so I could get power from somewhere else, but of course did not tell me how.

    QUESTION: Can I just run a cable from the battery and another from battery ground cable to the stereo to have power? How can I do that? I want it to be done also in a way that it is safe(what I mean is having fuses between battery and stereo, etc.) to be safe, but less expensive. Without the risk of burning the car, having live wires laying here and there. Thanks.

  • muzquiz_port Sep 09, 2010

    Finally my JVC is working, but now the sound is coming out only from front speakers(left and right), and with very low volume and bass. I hope it has nothing to do with not getting enough power, because I bought a tester from walmart and tested the red ignition(ON-12v and OFF=0v) and the yellow cable(12v ON or OFF), and connected the orange illumination cable to the red ignition cable. The voltage was ok. Stereo's illumination looks ok too. Turns on and off just fine. I don't thing I burned the speakers because I tested them with the original stereo, but just the speakers in the left(front and back) work with the original stereo. How can i test the speakers to match the correct wires? I followed this diagram step by step when connecting the speakers: http://www.installdr.com/Harnesses/GM-Wi... What could be wrong with the sound now? Did I follow the wrong diagram? Thanks.

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On any after market radio their is two 12v feeds one permanant for the memory and one switchable via the ignition switch ,so use a meter to find the permanant feed and then the switchable feed from the ignition switch ,the radio will earth out down the aerial outer coax ,iam sure this is your only problem you just dont have the correct feeds .Now speaker wires you can test by using a small 9v battery on teh cables till you hear a blip,now these speaker wires normaly have say a white and a white with a stripe in ,these two go together ,then another colour and so on ,the 12v feed wires often have an inline fuse in the cable or a rf winding choke coil ,but the newer ones have a universal wiring kit that you buy to plug into the loom for a specific model

Posted on Sep 06, 2010

  • Colin Stickland
    Colin Stickland Sep 08, 2010

    sorry about delay in answering just been busy working ,right dont worry about odd wires ,just check the feed wires and make sure they are correct then it should come on ,sounds to me like either you have burnt the set out playing with it and worrying about what colour wire should go to where without doing the basic groundwork first.You must identify the feed wires and the earth coming from the vehicle first before you even think about getting the radio out of the box .Never mind about reading the manual thats next after you have the feed wires .Like lots of people on here seeking help fair enough then quoting myself and other mechanics the stupid haynes manual thats only good for a wiring diagram .Now find the feeds and earth first ,then check the manual for the radio and connect it ,if it doesnt work then its faulty or you have connected the wires around the wrong way because you think that this or that wire is should be the same because the colours are the same?? Then its your own fault so you will have to buy yourself another radio and get it right this time

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In wiring the radio an ohm meter or test lamp will help a lot.
Using 1989-1990 and newer diagram.
First off, find the 12 Volt ignition wire. as indicated by I. Make sure it works by measuring voltage between it and the ground wire E with the ignition on(should be 12 volt. With ignition off the measurement should be 0volt. Connect this to the radio red wire.
Then comes the memory backup +12volt battery wire indicated by J. It should always be at 12Volt irrespctive of ignition switch position. Connect this to the radio yellow wire.
If you now connect the earth wire to the radio black wire you have to be able to power up the unit. With it powered up you can test the speakers individually.
The blue on the radio is for antenna remote activation. It powers the electric antenna when the radio is switched on and will also switch on the amp(if fitted).
The orange from the radio can be wired together with the ignition. It will then permanently keep the radio ilumination on

Posted on Sep 06, 2010

  • 2 more comments 
  • Rene Rossouw
    Rene Rossouw Sep 06, 2010

    I just noticed your last comment. You connected the radio's speaker wires to the orange as well? You may have damaged the unit. Let's hope not.
    You need a 12V for the memory and power and illumination. They can all come from the same source - battery positive. Remove all wiring from the radio. Run a lead directly from the battery positive and connect it to these 3 wires, all together. Then connect a wire from the battery negative to the earth of the unit. If you cannot power up the unit it is defective. If you are going to install your own wiring then remember to use an inline fuse as close as possible to your power source.
    Connections to the radio:


    • Red - Input : Power supply positive to power the unit.

    • Yellow - Input : Memory backup to keep saved settings with ignition off

    • Black - Input : Power supply Earth/negative

    • Blue - Output : Antenna and amp remote on.

    • Orange - Input : Power for the radio illumination
    Speaker connections are outputs and should never be connected to anything other than a speaker or amplifier High impedance input. They should also never be connected to earth.
    Shorted speaker connections can also cause problems as some radios have output protection that will shut down the unit when a shortcircuit is sensed.

  • Rene Rossouw
    Rene Rossouw Sep 07, 2010

    Yes it is possible. The stereo nagative can be any good grounding point. That is a point connected to the vehicle chassis close to the unit. Preferably use lugs to connect to screws in the bodywork, or solder a wire into an existing ground wire. Always insulate soldered joints with insulation tape. There are aftermarket lugs available that just clip onto electrical wiring but I prefer soldering.
    You have to decide how you want the stereo to operate.


    • Do you want to be able to operate it without the ignition switched on? Run all wiring from the battery except for the radio illumination.

    • If you want to turn the radio on and off with the ignition you will have to connect to the ignition switch as well.
    When wiring a fuse into a line it must be as close as possible to the positive power supply end of the wire. A fuse is there to protect the wire in the event of a shortcircuit. It will cut the power to the wire and prevent it from burning.
    For the illumination it would be best to locate a line that goes hot when you switch on the lights, this will allow the radio illumination when vehicle ligfhts are switched on.You will not need to wire a fuse into this line as it will already be protected by the vehicle lighting fuse as long as you use the same guage wire. else a 5 amp fuse will do. If you cannot find one, wire it to the red line on the stereo or to the ignition. The radio lights will come on as soon as the ignition is switched on. See diagrams. These are 4 modes of operation.


    • A - The stereo will only operate with the ignition on. Radio will illuminate with ignition switched on.

    • B - Stereo will operate at any time irrespective of ignition position. Illumination will operate along with vehicle lights.

    • C - Stereo will operate at any time irrespective of ignition position. Illumination will operate along with ignition.

    • D - Stereo will operate with ignition switched on. Ilumination will operate with vehicle lights on.
    Diagram legend :


    1. Fuse 15amp on #14 guage wire or 20 amp on #12 guage wire.

    2. Fuse 15amp on #14 guage wire or 20 amp on #12 guage wire.

    3. Line from ignition that goes hot (12V) with ignition switched on and 0Volt with ignition off.

    4. Line from vehicle lighting that goes hot(12V) with lights switched on and 0V with lights off.

    5. Line from stereo to antenna and/or amplifier


  • Rene Rossouw
    Rene Rossouw Sep 07, 2010

    When routing a wire through a vehicle try to run it next to other existing cable harnasses as far as possible as thes will already utilise the best route for heat and chafing protection. Wire can be held on to a harness by insulation tape or better : cable ties(ziplock ties). Try not to drill any holes through the firewall, rather enter through the rubber grommets or next to existing cable harness. If you have any further problems just leave a comment again and I'll get back to you asap.

  • Rene Rossouw
    Rene Rossouw Sep 09, 2010

    Possibilities are that your speaker outputs on the stereo are damaged or the speakers are wired incorrectly. Another is that you have an amplifier in the car that you are unaware of.
    Disconnect all speaker connections from the stereo.Use your multimeter to measure resistance on the speaker connections in the vehicle harness
    connectors. Start
    with, lets say, left front. Measure resistance between A and B(Light
    gray and tan). You should get less than 10 ohm. More than likely in the
    region of 5 ohm. If you dont get this reading keep the one meter lead
    in connector A. and measure across A-C, A-D, A-K, A-L, A-M, A-N until
    you get the proper reading. Once identified also measure between each of the 2 leads of a specific speaker and earth(negative on the vehicle) This is just to confirm there are no short circuited speaker wires. You should get no reading when measuring between a speaker wire and earth.
    If you get no reading or high readings(more than 10 ohm) on any of the speaker connections you probably have either an amplifier wired in the system or the speakers themselves are faulty.
    Remove the speaker from its installation in the door or where ever it is placed and measure on the speaker itself. To test the wiring connect the 2 wires togethr and measure at the harnass connector for that shortcircuit.
    Adjust the stereo balance to give power to the left speakers only. Adjust the fader to give power to the front speakers only.
    Now you will have to confirm the speaker wires on the stereo itself to identify which 2 wires are giving out power. Use your mutimeter(on voltage setting) or a loose speaker. Speaker outputs are normally 2 of the same colored wires but one will have a different colored line in it. Once identified, mark the wires clearly(masking tape will do), insulate their ends(dont connect yet) and move onto the next set ie right front and repeat the process.

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  • Master
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It should work. Check your radio fuse. Looks like you have all of the wires hooked up right. It is easy to blow the fuse on the yellow battery wire. It is going to be the radio fuse in your fuse block. Check your owners manual to find the location of the fuse.

Posted on Sep 06, 2010

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