Left door speaker is not working properly. How do I fix it.

most probable answer is a bad wire connection. Check the wires that go to the door to the speaker. If they are ok, then check the back of the radio.

There must be a brake in the speaker wires not all the way thou. U need to fallow the wires from stereo threw to speakers n u should find the problom.

Depends on which sound system you have - BOSE systems in Devilles have two left front speakers!
If it's an amp problem, you will have an error code (DTC) set which you can see with a code scanner.
Check to see if the L/R balance control is working properly - cycle it a few times to make sure there are no dead spots.
If it's the door speaker, it is probably water damaged or it has open coil wiring and will need replacing.

on all modern gm vehicles , the blinker noise and dining noise goes through the left frt speaker so if you speakers arent workin thats your problem call a dealer with your vin

you need to replace the left front door speaker

2002 Ford Mustang Car Stereo Radio Wiring Diagram
Radio Constant 12V+ Wire: Purple/Light Blue
Radio Switched 12V+ Wire: Black/Pink
Radio Ground Wire: Black/Light Green, Black
Radio Illumination Dimmer Wire: Light Blue/Red
Radio Antenna Trigger Wire: Orange/Light Blue
Front Speakers Size: N/A
Front Speakers Location: N/A
Left Front Speaker Wire (+): Orange/Light Green
Left Front Speaker Wire (-): Light Blue/White
Right Front Speaker Wire (+): White/Light Green
Right Front Speaker Wire (-): Green/Orange
Rear Speakers Size: N/A
Rear Speakers Location: N/A
Left Rear Speaker Wire (+): Gray/Light Blue
Left Rear Speaker Wire (-): Tan/Yellow
Right Rear Speaker Wire (+): Orange/Red
Right Rear Speaker Wire (-): Brown/Pink

This color code works for 87-93 mustang factory radio; it might work on yours as well. I'm not sure if it has the same fuses though.

Radio Connector:

Light Green / Yellow - Hot at all times (Fuse 8)
Yellow / Black - Hot in ACC or Run (Fuse 11)
Light Brown / Red - Goes to instrument panel dimming rheostat (Fuse 4)
Red - Ground
White / Purple - Hot in ACC or Run (Fuse 11)

Speaker Connector:

White / Light Green - (+) Right Instrument Panel & Door Speaker
Dark Green / Orange - (-) Right Instrument Panel & Door Speaker
Brown / Pink - (+) Right Rear Speaker
Pink / Light Brown - (-) Right Rear Speaker
Pink / Light Green - (+) Left Rear Speaker
Tan / Yellow - (-) Left Rear Speaker
Light Brown / White - (+) Left Instrument Panel & Door Speaker
Orange / Light Green - (-) Left Instrument Panel & Door Speaker
Hope this helps.

I'm not sure what year you have but this color code works for 87-93 mustangs.

Radio Connector:

Light Green / Yellow - Hot at all times (Fuse 8)
Yellow / Black - Hot in ACC or Run (Fuse 11)
Light Brown / Red - Goes to instrument panel dimming rheostat (Fuse 4)
Red - Ground
White / Purple - Hot in ACC or Run (Fuse 11)

Speaker Connector:

White / Light Green - (+) Right Instrument Panel & Door Speaker
Dark Green / Orange - (-) Right Instrument Panel & Door Speaker
Brown / Pink - (+) Right Rear Speaker
Pink / Light Brown - (-) Right Rear Speaker
Pink / Light Green - (+) Left Rear Speaker
Tan / Yellow - (-) Left Rear Speaker
Light Brown / White - (+) Left Instrument Panel & Door Speaker
Orange / Light Green - (-) Left Instrument Panel & Door Speaker
Hope this helps.

LG/Y --Power
Y/BK --Ignition
BK -- Ground
LB/R -- Illumination (+)
Or/Bk -- Illumination (-)

DG/O -- Right door speaker (-)
W/LG -- Right Door Speaker (+)

O/LG -- Left Door Speaker (-)
LB/W -- Left Door Speaker (+)


If it has rear speakers:

O/R -- Right Rear Speaker (+)
Bk/W -- Right Rear Speaker (-)

PK/LG -- Left Rear Speaker (+)
T/Y -- Left Rear Speaker (-)

Hope this helps

i have a 1994 eagle vision, with the premium sound system (infinity) and yes you do have a amp in your car if you have that sound system and its in the trunk of your car to the left while looking at your trunk from the back of the car :) also if you tryed putting in diffrent speakers other then stock thats your problem you have to rewire new speakers cant use old wiring because it goes threw the stock amp and for some reason the stock amp only works with the stock speakers :P