![]() ![]() The factory amplifier is an audio amplifier that is installed in the vehicle at the factory and is used to power the car’s speakers. The black with white stripe wire in a car stereo wiring harness is typically used as a ground wire for the factory amplifier. This wire should be connected to a metal ground point in the vehicle, such as a screw or bolt on the chassis. The black wire is the ground wire, which provides a path for electricity to flow to the car stereo. This wire should be connected to a switched power source, such as the ignition switch or a fuse in the fuse box. The red wire is the accessory power wire, which provides power to the car stereo when the ignition is turned on. This cable has to be permanently attached to the battery or another reliable power source. This wire provides power to the car stereo even when the ignition is turned off so that the stereo can retain its settings and any stored media. The yellow wire is the continuous power wire, also often referred to as the memory wire. Here is a general guide to the colors and functions of the wires in a Pioneer wiring harness: Yellow Wire How To Understand Pioneer Wiring Harness Color Codes? Pioneer Wiring Harness Installation Guide.Tips for Identifying Wiring Harness Color Codes.Pioneer Wiring Harness Color Code Table.How To Understand Pioneer Wiring Harness Color Codes?.This is the high-low-high signal the Pioneer needs. In some cases when starting up the stereo, the Pioneer will give a prompt saying that you must pull the hand brake up, down, then up again, in order to use a particular feature. Although this will work in some cases (in the limited testing I did), it will fail to provide the high-low-high signal when needed, thus disabling some stereo functionality. It's been suggested that simply grounding the green wire is all you need to do to get the stereo to function properly. Note: It's my understanding that only newer Pioneer models require the high-low-high signal, so if you have an old model maybe this doesn't apply to you What is the high-low-high signal required by the Pioneer? In other words, when the hand brake is down, the red/black wire is at 0V, when it's up, the red/black wire is at 12V. When the hand brake is down, it pushes on a little black pin that completes the circuit, grounding the red/black wire. Where's the ground wire? Well, the switch is grounded directly to the chassis of the car so there is no need for a ground wire. How does the parking brake switch work?įirst, notice that there is only one wire coming out of the switch. It carries a 12V signal when the car's key position is at on not when it's at acc. You can test this by touching the green wire to the chassis and watch some stereo buttons fade in and out. When the green wire is grounded, some stereo functionality will be opened up. I also figured out the answer to several of my other questions, What does the green wire do? Once I fixed the wire tap, it worked as expected. Turns out I didn't install the wire tap properly, thus current couldn't flow between the green and red/black wire. I read something about Pioneer stereos requiring a high-low-high signal in the green wire at a particular frequency, this is pretty confusing to me and it's very hard to find documentation on the subject. ![]() How does the parking brake switch even work? What happens when the parking brake is pressed down? Does that close a circuit, thus grounding the red/black wire? Shouldn't the switch have a ground wire coming out of it somewhere (it only has the red/black wire)? Or since the switch is connected to the metal chassis does it not need the additional ground wire? The problem is that the Pioneer stereo still thinks that I'm driving, even when the parking brake is up. ![]() As you can see, I connected the light green and red/black wires using a wire tap connector. ![]() Thus, I assumed that the red and black wire must be the power in side. The instructions in the Pioneer manual say that the light green wire should be connected to the power side of the parking brake switch, however, the switch in the picture only has one wire coming out of it (the red and black one). light green wire which is the parking brake wire that comes with the Pioneer harness.red and black wire which was originally there.This means that I can't use certain functionality in the stereo. I've wired almost everything up correctly and it runs without any issue, except the stereo always thinks that I'm driving, i.e., it thinks that the parking brake is always disengaged. I have a 2003 toyota rav4 and I'm trying to install a new Pioneer double din stereo. ![]()
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