JBL WIRING DETAILS FOR CAR

 Jbl amp/ speakers | Lincoln vs Cadillac Forums

the JBL system in my vehicle and want to hook up the jbl amp and sub amp. The JBL amp simply plugs into the wiring harnes but where do I connect the yellow and red wires from the sub amp?

According to the diagram the yellow is power and always hot but what does "amp power return" mean on the red wire?

The Return is your negative. Use a voltmeter and you will see this.

For speakers, since the current is basically alternating, the "+" and "-" are for reference to hook all of the speakers up in the same "polarity" so that a drum beat pushes all of the speaker cones in the same direction - outward, for example. If you connect even one speaker in the opposite polarity, it will negate or cancel much of the sound energy from the remaining speakers and the db or sound pressure output of the system will be reduced.

BL = Blue

N = Natural

BK = Black

O = Orange

BR = Brown

PK = Pink

DB = Dark Blue

P = Purple

DG = Dark Green

R = Red

GR = Green

T = Tan

GY = Gray

W = White

LB = Light Blue

Y = Yellow

LG = Light Green

The speaker outputs according to the first diagram are (from top to bottom):

LF +
LF -
LR +
LR -
RF +
RF -
RR +
RR -

For the subwoofer, BLACK is "+" and the BLACK/WHITE stripe is "-".

C451 is to the front/rear woofers (right and left front+rear woofers are tied together)
C452 is for the front and rear tweeters (each tweeter is separate channel)
C453 is the input from the radio.

  

JBL SPEAKER WIRING LINCOLN

The amp is located directly under the eye level brake light, in the trunk. You will have to drop the carpet from the inside of the trunk ceiling in front of the trunk opening. There are four large round plastic fasteners that hold the carpet panel up. They are just to the front of the trunk lip. Once the four fasteners are out and the carpet panel is loose from the trunk ceiling, you can just pull the whole thing out of the trunk and set it aside. (It folds down behind the seat, but there are no more fasteners.) The four fasteners are just "Christmas tree" fasteners. I usually use a door panel removal tool or in the absence of that, a set of open needle nose pliers with one jaw forced under each side of the button will suffice to pry the button fastener out with little damage.

You will see the large black finned amp right in your face hanging from the underside of the package tray. If you have premium sound, it will be an aluminum colored unit. There are two plugs. One is power and speakers. The other one will be the other end of the gray cable that you cut. (audio in) There is nothing else in there but the wires that carried the audio signal from the dash.

 black JBL audio amp CONNECTOR  LOCATION

To illustrate where to find the keyless entry code (red circle) but just to the left is the black JBL audio amp. (In fact, the gray wire from the front runs right through the red circle.) The power and speaker cable is just out of the picture to the left.

This view is from inside the trunk looking up under the package tray. You can see the passenger side rear speaker in the image.