What are each wire color for the headlight wire harness? Trying to wire new DRL's

Tiny
ASSCHADDER
  • MEMBER
  • 2004 CHEVROLET IMPALA
  • 85,000 MILES
Looking for description of each wire located in the headlight wire harness. What color are the turn signal wires? Your last answer helped alot, thanks.
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Tuesday, September 20th, 2011 AT 3:01 AM

24 Replies

Tiny
KEN
  • ADMIN
Hello,

Here are the full wiring diagrams in the images BELOW. Left front turn signal wire is light blue. Left rear turn signal wire is yellow. Right front turn signal wire is dark blue. Right rear turn signal wire is dark green. Grounds are black. Common power for tail and license plate lights is black and white. Common power for front parking lights is yellow. High beams are pink wires. Low beams are dark blue. Ground is going to be black. Check out the headlight and DRL wiring diagrams (BELOW). Best, Ken
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Wednesday, December 14th, 2016 AT 11:49 AM
Tiny
JUSTIN1988
  • MEMBER
  • 2001 CHEVROLET IMPALA
  • 3.8L
  • V6
  • FWD
  • AUTOMATIC
  • 107,000 MILES
When the car is off the LED and Halo lights are still on. I was wondering what wiring do I connect to so they will shut off when car is turned off?
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Friday, November 9th, 2018 AT 8:12 AM (Merged)
Tiny
CARADIODOC
  • EXPERT
That has to be some kind of aftermarket modification. The person who installed the lights connected them to the wrong circuits. Where the wires should be connected depends on when you want the lights to turn on.
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Friday, November 9th, 2018 AT 8:12 AM (Merged)
Tiny
CAR_MENDOZA_1984
  • MEMBER
  • 2004 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 75,000 MILES
I have an 04 impala ls 75000 miles I cant figure out whats going on with my headlight. The right ones work great but the ones on the left are dim. I tryed changing the bulbs nothing. They were fine and two days ago while I was driving it said highbeams out so I thought I just needed to replace them but their still dim. Any ideas?
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Friday, November 9th, 2018 AT 8:12 AM (Merged)
Tiny
SATURNTECH9
  • EXPERT
So is your low or high beam dim or are both of them dim?
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Friday, November 9th, 2018 AT 8:12 AM (Merged)
Tiny
CAR_MENDOZA_1984
  • MEMBER
The both are. Like really really dim
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Friday, November 9th, 2018 AT 8:12 AM (Merged)
Tiny
SATURNTECH9
  • EXPERT
Let's try this turn on the head light's on low beam then go to the dim side unplug the low beam bulb. Check and see if you have battery voltage to the orange wire. Then see if you have less then 2 ohm's to ground to the dark blue wire. Let me know what you find.
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Friday, November 9th, 2018 AT 8:12 AM (Merged)
Tiny
CAR_MENDOZA_1984
  • MEMBER
Sorry I took a while to answer but how do I check them?
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Friday, November 9th, 2018 AT 8:12 AM (Merged)
Tiny
SATURNTECH9
  • EXPERT
So both your high beam and low beam are dim on the left?If so I told you on the my last post how to test the low beam side. Here is what I said in my last post.
Let's try this turn on the head light's on low beam then go to the dim side unplug the low beam bulb. Check and see if you have battery voltage to the orange wire. Then see if you have less then 2 ohm's to ground to the dark blue wire. Let me know what you find.
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Friday, November 9th, 2018 AT 8:12 AM (Merged)
Tiny
CAR_MENDOZA_1984
  • MEMBER
Yeah but how do I check the voltage?
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Friday, November 9th, 2018 AT 8:12 AM (Merged)
Tiny
TSF_92
  • MEMBER
  • 2004 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 113,000 MILES
I've been have problems with my tail lights and head lights not working. People on here said it could be my head light switch so I replaced that and they still don't work. Some on said on here that it could be the BCM. What is the BCM?
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Friday, November 9th, 2018 AT 8:12 AM (Merged)
Tiny
DOCFIXIT
  • EXPERT
Body Control Module located on left kick panel near park brake. Controls many functions including headlights
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Friday, November 9th, 2018 AT 8:12 AM (Merged)
Tiny
SATURNTECH9
  • EXPERT
You would check the voltage with a multimeter set to dc voltage 20 volt setting. The black lead to ground the red lead to the orange wire. You would use the same multimeter set to the 200 ohms scale the black wire to a good ground and and the red wire to dark blue wire and your looking for a reading of 2 ohms or less.
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Friday, November 9th, 2018 AT 8:12 AM (Merged)
Tiny
CAR_MENDOZA_1984
  • MEMBER
Ok ill let you know thanks
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Friday, November 9th, 2018 AT 8:12 AM (Merged)
Tiny
GBUHLER
  • MEMBER
  • 2004 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 150,000 MILES
The dim lights on my 2004 chev. Impala will not turn on. The daytime driving lights work, however as soon as the sun goes down they turn off, as they should, and the dim lights will not turn on automatically or with the switch. The brignt lights work fine. I have checked the bulbs and the relay.
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Friday, November 9th, 2018 AT 8:12 AM (Merged)
Tiny
KHLOW2008
  • EXPERT
System is equipped with self diagnostics and if there are trouble codes, a scan would assist in getting to the bottom of the problem.

The chart shows the diagnostic procedures.
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Friday, November 9th, 2018 AT 8:13 AM (Merged)
Tiny
2CARPROS-ARCHIVES
  • MEMBER
  • 2004 CHEVROLET IMPALA
  • 120,000 MILES
My front headlights are acting up. All 4 beams are on at one time. The left one's work as they should, and the right are both always dim, and when low beam is on, the high beam of the left is dim, and vice versa. Its none of the fuses, it's not the bulbs. I got it down to the grounds. But Where do I find the ground for the headlight?
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Friday, November 9th, 2018 AT 8:13 AM (Merged)
Tiny
JDL
  • EXPERT
Check for applicable troubles codes. There are lighting trouble codes. If your going to work on your own vehicles, at the least, you need an obd2 code reader that will read manufacturer specific codes as well as po codes.

Take the lamp connector loose, with headlamps on, check for the same voltage on all head lamp circuits, use chassis ground not headlamp connector ground.

In the diagram, the top wires are voltage, bottom wires are ground. The dimmer switch is part of the ground circuit, if you wan t to word it that way. The low beams ground through the headlamp relay in diagram. The high beams ground through dimmer switch ground. The ground wire location is the same for high and low.

Sorry it took so long.
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Friday, November 9th, 2018 AT 8:13 AM (Merged)
Tiny
WILLIAM E HENDRICKSON
  • MEMBER
  • 2004 CHEVROLET IMPALA
Electrical problem
2004 Chevy Impala 6 cyl Front Wheel Drive Automatic

While driving at night my headlights go out when I switch from bright to dim. They return when I switch again to bright. I'm driving with my bright lights against oncoming traffic. I don't mind paying to have it repaired if it is truly something that I can't fix myself (replacing a relay or fuse), but I hate to take it into the shop where they charge me $50 to put it on their diagnostic machine while they go on a fishing expedition to find out what all they can scare me into repairing.
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Friday, November 9th, 2018 AT 8:13 AM (Merged)
Tiny
RHALL77
  • MEMBER
Sounds like a multi function swith. You need to remove the air bag to get at it. I would suggest having a professional do it
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Friday, November 9th, 2018 AT 8:13 AM (Merged)

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