JVC stereo power up problem.
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JVC stereo power up problem.
i bought a JVC Kd-s48 reciever a few months back but when i had gotten a battery installed, it suddenly stopped working. thinking that it was done for, i just swapped in the Factory stereo back in the car. Just yesterday my friend and i were tinkering with the JVC to see if we could get it to work, so we hooked it to the battery (we connected the Red and Yello wire to the positive terminal and the ground wire to the negative) and voila, it worked just fine. so thinking that i was in luck, i reattached the wiring harness and installed it in my car, however, it's not powering up at all. i checked the fuses and they are fine. to be sure, i reconnected the factory and it started up fine. so now im confused. i dont understand how the JVC will work when connected to the battery but wont even power on when connected by a wiring harness. anyone have suggestion or a fix for this?
Honda-Tech Member
Joined: Mar 2007
Posts: 11,399
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From: East Coast 506, Canada
Re: JVC stereo power up problem.
Check your wire harness for proper voltage and ground......
Problem: Installed an Aftermarket Head Unit and Now it Has No Power
Possible Solution:
- First off, check your wiring. If you have a voltage meter or a test light, test the ground (black), constant 12v (yellow), and accessory 12v (red) wires to make see if you have the correct voltage in the correct wires, as well as a good ground. Constant will always be 12v, whether or not your car is on. Accessory will be 12v only when you turn the key to the “ON” position or the car is running. Make sure to use your ground, as well as another ground (like the frame or body of the car) while testing your constant and accessory to test that you have a good ground.
If you find that one of your power wires or ground wires are not correct, check your vehicle wire diagram and make sure you have the correct corresponding power and ground wires.
- If you do not have power, and you know for a fact your wiring is correct, check the fuses under the dash or under the hood (depending on your vehicle). Easiest way to locate the correct fuse is to look in the Owner’s Manual and find the fuse number and box location. Your manual should indicate which fuse is for the “Accessory”, “Car Stereo”, or something of that sort. After finding the location of the fuse, pull it and make sure that the leads are not corroded and that the fuse has not been broken or popped.
- If your speakers randomly stopped working and you noticed that your amplifier is in protection mode, there are a few reasons why this might have happened.
• Most aftermarket amplifiers have a protection from low and high voltage. If your alternator is producing too much power, it will trigger the amplifier’s protection mode. Vice versa, if your battery is low and the amplifier is not receiving a constant 12v, it will enter protection mode.
• Amplifiers will also enter protection mode if there is a short somewhere. If you have a signal RCA wire that is shorting out, this could be your problem so check to see if your RCAs are in-tact and not shorted. Also, if one of the output channels are shorted out, or you have a blown speaker, many aftermarket amplifiers will enter protection mode. Disconnect all output channels and see if it will return to normal operation.
Originally Posted by www.caraudionow.com
Problem: Installed an Aftermarket Head Unit and Now it Has No Power
Possible Solution:
- First off, check your wiring. If you have a voltage meter or a test light, test the ground (black), constant 12v (yellow), and accessory 12v (red) wires to make see if you have the correct voltage in the correct wires, as well as a good ground. Constant will always be 12v, whether or not your car is on. Accessory will be 12v only when you turn the key to the “ON” position or the car is running. Make sure to use your ground, as well as another ground (like the frame or body of the car) while testing your constant and accessory to test that you have a good ground.
If you find that one of your power wires or ground wires are not correct, check your vehicle wire diagram and make sure you have the correct corresponding power and ground wires.
- If you do not have power, and you know for a fact your wiring is correct, check the fuses under the dash or under the hood (depending on your vehicle). Easiest way to locate the correct fuse is to look in the Owner’s Manual and find the fuse number and box location. Your manual should indicate which fuse is for the “Accessory”, “Car Stereo”, or something of that sort. After finding the location of the fuse, pull it and make sure that the leads are not corroded and that the fuse has not been broken or popped.
- If your speakers randomly stopped working and you noticed that your amplifier is in protection mode, there are a few reasons why this might have happened.
• Most aftermarket amplifiers have a protection from low and high voltage. If your alternator is producing too much power, it will trigger the amplifier’s protection mode. Vice versa, if your battery is low and the amplifier is not receiving a constant 12v, it will enter protection mode.
• Amplifiers will also enter protection mode if there is a short somewhere. If you have a signal RCA wire that is shorting out, this could be your problem so check to see if your RCAs are in-tact and not shorted. Also, if one of the output channels are shorted out, or you have a blown speaker, many aftermarket amplifiers will enter protection mode. Disconnect all output channels and see if it will return to normal operation.
Honda-Tech Member
Joined: Feb 2007
Posts: 129
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From: central, NJ, USA
Re: JVC stereo power up problem.
Check the "radio" fuse and all fuses again to make sure you didn't pop one during the install. Just to be clear, when doing electronic install- disconnect the (-) negative cable until you are done- maybe you already do this but just in case.
Are you connecting by color to your radio harness or are you doing it by wiring diagram?
Are you connecting by color to your radio harness or are you doing it by wiring diagram?
Honda-Tech Member
Joined: Mar 2007
Posts: 11,399
Likes: 69
From: East Coast 506, Canada
Re: JVC stereo power up problem.
Not saying you have the wiring wrong.... I'm asking you to test the voltage and ground from the car harness to ensure you have 12v power and a good conductive ground. Some aftermarket stereos won't work if there is too much or not enough voltage,and/or an improper ground.
Makes me think there could be something with the voltage supply or ground quality when you say that the stock radio works when installed and that your aftermarket unit works when hooked up directly to the battery but not in the car.
Makes me think there could be something with the voltage supply or ground quality when you say that the stock radio works when installed and that your aftermarket unit works when hooked up directly to the battery but not in the car.
Honda-Tech Member
Joined: Apr 2011
Posts: 666
Likes: 1
From: Savannah, GA
Re: JVC stereo power up problem.
I would say that since it only stopped working since you hooked up your new battery. First thing I would do, is ensure that the battery connections are good, clean and tight. Check voltage on the battery between positive and negative terminals. With that info, I would remove the radio, and check the voltage. It should be around what you showed on the battery. First remove the harness from teh radio, check between 12v hot all the time and the ground pin in the harness. Also check the switched 12v to the ground in the harness.
If they show voltage that is different from what you got on the battery...cehck the ground first. Run a wire from the negative battery terminal, and use it as the ground. Then check both both power sources in teh radio harness. If voltage now matches battery..then youve found the problem. If not...then you need to check the positive power to the radio. Start with the fuse...if it is good...then it is a wiring issue...youll need to go step by step checking each leg...until your find the opened wire.
If they show voltage that is different from what you got on the battery...cehck the ground first. Run a wire from the negative battery terminal, and use it as the ground. Then check both both power sources in teh radio harness. If voltage now matches battery..then youve found the problem. If not...then you need to check the positive power to the radio. Start with the fuse...if it is good...then it is a wiring issue...youll need to go step by step checking each leg...until your find the opened wire.
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