Question about Jensen VX7020 NAVIGATION RECEIVER JCAM1

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What should the backup wire in the harness connect to?

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The backup wire is typically attached to an always live power source so that when you turn the key off it retains settings.

Posted on Jul 20, 2015

  • techmike Sep 29, 2017

    Actually the "back up" wire connects to the back-up light circuit. It initiates the back-up camera when the car/truck is placed in reverse - if you have one installed.


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I am installing after market stereo/wireless back up cam into a 2007 Dodge Dakota and wondering where to source power for cam receiver? All the instructions say are to connect to 12V source.

You should get an aftermarket installation harness for your new head unit, these are available at auto parts chains and Wal-Mart, online, etc. When you remove the stock stereo from your Dakota, it’ll have a plug or two that go to the truck’s wiring harness. The aftermarket wiring harness you’ll buy has identical ends so it plugs right in and the other end(s) will connect to the new stereo’s wiring that should be running out of the back of your new head unit. You can hook the BackUp Camera’s Power Wire in with your Head Unit’s Red(+) Power Wire as that’s a good spot since it’ll always have power when you need it to in that location. The BackUp Cameras usually have a “trigger” or “activation” wire that makes the camera come on and the Cameras I’ve installed always hook to your reverse light circuit or the truck’s neutral safety switch, so it’ll come on and display the camera view on your head unit’s Screen when you put the vehicle in reverse. A google search will tell you where and what color the wire is for this, for the reverse lights or neutral safety switch(usually under dash or under the steering column’s outer plastic cover between the steering wheel and the dash or instrument panel(speedometer, gauges, etc).

Definitely get the wiring harness for installing the aftermarket stereo, the only other way to do this is to make a big mess and you don’t want to do that since the harness is under $10.

So, no worries, this is simple and you’ll get it, just get the harness, and find out where the reverse light circuit is and wire the activation wire of the camera to it, maybe your camera only has one wire, if so that’s where it goes and you can disregard what I said above about running it with your new head units wiring(the red (+) Power Wire).

Go to AutoZone or your parts store of choice and ask for a harness to install an aftermarket stereo in your Dakota, they’ll hook you right up for a few dollars and you’ll be done in no time! Good Luck!

Reverse gear signal input h2

Backup Lamps
The backup lamp request signal is sent from the powertrain control module (PCM) to the body control module (BCM) on the class 2 message system. This signal is based on the park neutral position (PNP) switch signal. The BCM supplies voltage on the backup lamp supply voltage circuit to the backup lamps and to the automatic day/night mirror. Voltage for the courtesy lamp supply voltage circuit and backup lamp supply voltage circuit is from the TBC B fuse in the instrument panel fuse block directly through the BCM to these circuits. A short to ground on either of these circuits will open the fuse. The backup lamps are grounded at G401.
For trailer wiring, a separate backup lamp circuit is connected through the underhood fuse block from the TRLR B/U 10 A fuse to the trailer wiring harness.

Why don't back-up lights work?

Wire harness in trunk. : Toyota Camry Common Electrical ... > Problems > Toyota > Camry
Ground wire coonection for tail light Camry 1999. All the lights ( license plate, tail,reverse) that are connected to the trunk are not working.... 1999 Toyota Camry.
images for toyota camry backup lights not working

When I power up the unit, the camera is displayed immediately, the backup wire turns the screen off.

There's a wire in the head unit harness that's meant to be connected to the vehicle's reverse light wire. If you don't have a rear view camera, this wire should not be connected to anything.

Who do you get in to change the back up light

Welcome to



1. Open the rear compartment lid.

2. Remove the rear compartment lid trim.

3. Pull back on rear compartment trim panel.

4. Disconnect the backup lamp connector (5) from the rear compartment lid wiring


5. Press the grommet (3) out of the rear compartment lid.

6. Remove the fasteners (4) securing the backup lamp (1) to the rear compartment lid


7. Remove the backup lamp (1) from the rear compartment lid (2).



1. Route the backup lamp connector (5) and the grommet (3) through the rear

compartment lid Q).

2. Install the backup lamp (1) to the rear compartment lid(2).

3. Install the fasteners (1) in order to secure the backup lamp (I) to the rear

compartment lid(2).

NOTE: Refer to Fastener Notice in Service Precautions.


Tighten the fasteners to 4.5 N.m (40 lb in).

4. Verify that the grommet (3) is filly seated in the rear compartment lid (2).

5. Connect the back-up lamp connector (5) to the rear compartment lid wiring harness.

6. Install the rear compartment lid trim.

7. Close the rear compartment lid.


Thank you for using

Regards, Lee Davidian


How do you replace reverse bulb on 2001 deville?

2001 Cadillac DeVille V8-4.6L VIN 9
1. Pull down the rear compartment lid trim. Refer to Compartment Lid Trim Replacement - Rear in Trunk/Liftgate.
2. Disconnect the electrical connector.
3. Remove the fasteners that secure the backup lamp assembly.
4. Remove the backup lamp assembly.
5. Remove the bulb assembly.
6. Remove the bulb.
1. Install the bulb into the bulb socket.
2. Install the bulb assembly into the backup lamp assembly.
3. Pull the wire harness through the body and seat the grommet.
4. Install the backup lamp assembly to the rear compartment lid.
NOTE: Refer to Fastener Notice in Service Precautions.
5. Install the fasteners in order to secure the backup lamp assembly.
Tighten the fasteners to 4.5 N.m (40 lb in).
6. Connect the electrical connector.
7. Install the rear compartment lid trim.

Need to hook up wiring harness for boat trailer. conector has been cut from ford explorer 94 4x4. dont know which wires need to be wired together.

the best way is with the use of a test light and find a good ground for one end and use the other to find your signals with the key on so to ensure power to the wires themselves and then with a 2 x 4 ahainst the seat propped the brake or assistance if available and find them as well also backup lights with the tire chucked so it dont roll on you find these as well by connecting via the diagram that the new harness came with or if none is available connect them until they are correctly working order then secure them should have a quick disconnect coupler with it so you may remove it for future use

License plate bulbs on 98 Park Avenue

License Plate Lights Removal & Installation 1997 – 2000 To Remove:

License/backup Lamp Assembly


  1. Remove the rear compartment lid trim. (if necessary)
  2. Disconnect the license/backup assembly connector from the body harness.
  3. While removing the license/backup lamp assembly from the rear compartment lid, disconnect the harness grommet from the rear compartment lid.
  4. Remove the license lamp housing from the license/backup lamp assembly.
  5. Remove the license lamp bulb from the housing and socket.
To Install:
  1. Install the license lamp bulb into the socket and housing.
  2. Install the license lamp housing onto the license/backup lamp assembly
    • Torque the fastener to 18 in-lb (2 Nm).
  3. While holding the license/backup lamp assembly, install the harness grommet to the rear compartment lid.
  4. Install the license/backup lamp assembly
    • Torque the fasteners to 53 in-lb (6 Nm).
  5. Connect the license/backup assembly connector to the body harness.
  6. Install the rear compartment lid trim. (if necessary)

91 corvette backup light do not work also 3rd brake light ,bulb&fuses are ok.

I had the same problem with a 91 mazda 626. turned out that the wires that ran from the lights along the trunk and back into the harness were broken from opening/closing the trunk. i would check around that area first.
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