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Parking brake wire override

Tryong to hook up my dvd player in my car, but I do not know how to override the parking brake wire can you help?

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DVD head units have one extra wire in their wiring harnesses, compared to a standard CD head unit. On my Jensen, it's a peach-colored wire, and is the activation wire for the DVD feature. During the installation, the instructions call for this wire to be tapped into the emergency brake indicator light wire. The reason is this:

The e-brake indicator light is what is called a "ground complete" circuit. That means that the bulb always has power applied, but when you pull the brake, that puts a ground to the wire and completes the circuit, allowing it to illuminate. The head unit sees this ground, and activates the DVD player.

In my Jensen unit, I simply ran this wire to a ground (I used a screw near the fuse box), and I put a switch on the wire, so I could break the ground contact at will. Jensen calls for a procedure to activate DVD playback. In their instructions, they tell you to select DVD from the option menu, and when the "lawyer screen" comes up (the one warning you to park before you watch a movie), you release the e-brake for 3-5 seconds, and then reapply it. To simulate that with the switch I used, I leave the switch closed (activated), and select DVD. Then I flip the switch "off" for 3-5 seconds, and flip it back "on". This tricks the head unit into thinking I put the e-brake off for a few seconds and then put it back on, and the movie will start. Then I can drive away.

Basically, ground the wire that is used for DVD activation, and put a switch inline on it. Then you can break and reapply the ground in whatever manner is required by the manufacturer of your head unit. If there is no off/on sequence with yours, as there is with mine, simply ground the wire to a screw inside the dashboard and you're done.

Posted on Aug 11, 2008

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You can't really do this apart from hooking the wire up-to something which is always live and low currant which will make unit think parking brake is always on.
Apart from that you can't and shouldn't for safety as you can be done for driving without due care and attention, And failing to maintain eyes on the road while in charge of a motor vehicle.
Hook it up to something low voltage and it will assume parking brake is active always and will operate DVD Playback while driving.

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Hellow. I got a Naxa ncd 688 and a friend connected the stereo, I had a problem because i can,t watch videos or DVD, and I saw something in the manual about the parking switch. Please Help.


I have a Naxa NCD-694, and I heard about similar problems. Apparently when you ground it like it tells you (the green long wire) to the parking brake, the video screen is set to disengage automatically! ((Naxa says if you dont hook up to your parking brake, your video screen might not play)) However after trying the following work-around myself, I found a few other people who had gotten around this safety feature with no consequence (other then distraction!) I guess NAXA just claims that, so they wont get sued if you crash while watching dvds in your car! *Its really simple! Just unhook the long (at least a foot or so) green wire (It should be labled "ground-Parking Brake" on it too) you previously attatched to your parking brake wire, and then ground it somewhere else! I just hooked it up to my black ground also coming out of the back of my naxa. (If you want to verify this b4 you unhook your deck, go in your car now, and lift your parking brake, and pop in a DVD! I bet itll play!) The wire will turn off the screen whenever the parking brake isn't engaged(or not grounded) So by grounding it to something permanent (in this case the black ground wire), your unit will never recieve the signal saying to turn off the screen!
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Need to bypass 06 Infinity factory dvd player to watch dvd while in drive


If your system is tied to the parking brake, check and see (Technical Manual) if the parking brake works at 5 volts instead of 12. Usually this is the case. If so you will need to locate that wire and cut it. (May void warrranty) Next you will need to get a voltage regulator from Radio Shack, This will require some soldering. Solder per the instructions to a switch. Make sure the switch is in the off position and start the car. When you get the splash screen flip the switch. The DVD player will see the 5 volts as the parking brake being engaged and allow it to be viewed.

An alternative would be to again, follow the wire, cut it, put one end to the chasis and a switch. Again make sure the switch is off and turn the car on. When the DVD player starts, flip the switch. This only works if your system is designed to see the wire as being grounded and then not.

You can not simply attach the wire to the chasis and go from there. You can test this be starting the DVD player, disconnecting the wire and connecting it again to the chasis. If the DVD plater starts, you have found your solution and only need a switch.

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I have an eonon GPS/DVD/Bluetooth flip up touchscreen car stereo. Navigation works fine; when I swith to dvd or backup camera, unit screen shuts off.


Do you have the PARKING BRAKE ON??? You need to have the wire coming from the back labeled PARKING BRAKE hooked to ground. You also might have a radio damaged during installation. You can email me at eightballproaudio@yahoo.com, I am an unauthorized distributer of eonon radios...

Dec 12, 2008 | Car Speakers & Subwoofers

1 Answer

I cant play dvds with out the parking brake on but i have my jensen in my house right now so how do i get the override code to come up


I don't know where everyone keeps coming up with the idea that there's a code you can enter to defeat this lockout.

DVD head units have one extra wire in their wiring harnesses, compared to a standard CD head unit. On my Jensen, it's a peach-colored wire, and is the activation wire for the DVD feature. During the installation, the instructions call for this wire to be tapped into the emergency brake indicator light wire. The reason is this:

The e-brake indicator light is what is called a "ground complete" circuit. That means that the bulb always has power applied, but when you pull the brake, that puts a ground to the wire and completes the circuit, allowing it to illuminate. The head unit sees this ground, and activates the DVD player.

In my Jensen unit, I simply ran this wire to a ground (I used a screw near the fuse box), and I put a switch on the wire, so I could break the ground contact at will. Jensen calls for a procedure to activate DVD playback. In their instructions, they tell you to select DVD from the option menu, and when the "lawyer screen" comes up (the one warning you to park before you watch a movie), you release the e-brake for 3-5 seconds, and then reapply it. To simulate that with the switch I used, I leave the switch closed (activated), and select DVD. Then I flip the switch "off" for 3-5 seconds, and flip it back "on". This tricks the head unit into thinking I put the e-brake off for a few seconds and then put it back on, and the movie will start. Then I can drive away.

Basically, ground the wire that is used for DVD activation, and put a switch inline on it. Then you can break and reapply the ground in whatever manner is required by the manufacturer of your head unit. If there is no off/on sequence with yours, as there is with mine, simply ground the wire to a screw inside the dashboard and you're done.

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