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Headlight low beam not working. Bulb and fuse are good.
On my 05' Crossfire the passenger side low beam just quit working. Changed the bulb and checked the fuse. Still doesn't come on. Double checked the old and new bulbs, both measure resistance with my multimeter, so they should be good. Measured the fuse in the dash fuse panel with the headlight switch on, voltage at both fuse terminal tops. Measured voltage at the bulb connector, only .7v there. Is there a relay somewhere for the headlights? I know there's the bcm relay box by the battery, does this manage headlight power as well?
First post here for me, but I've been viewing for about a year now. Thanks in advance for the assistance and thanks a ton for all the information here I've used this year! |
Re: Headlight low beam not working. Bulb and fuse are good.
There are no relays involved, best option is to meter the voltage at the headlight connector to see if problem is internal to the headlight, or external wiring.
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Re: Headlight low beam not working. Bulb and fuse are good.
The connector is reading .07v
https://cimg9.ibsrv.net/gimg/www.cro...7c0ac0f55f.jpg |
Re: Headlight low beam not working. Bulb and fuse are good.
No, not the INTERNAL bulb connector, measure at the connector that goes to the headlight.
https://cimg2.ibsrv.net/gimg/www.cro...da3d387fb9.png |
Re: Headlight low beam not working. Bulb and fuse are good.
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Re: Headlight low beam not working. Bulb and fuse are good.
Then unfortunately you have a wiring problem, as you have most likely already concluded.
https://cimg6.ibsrv.net/gimg/www.cro...2d5a75c385.png |
Re: Headlight low beam not working. Bulb and fuse are good.
Originally Posted by Chiver79
(Post 915925)
On my 05' Crossfire the passenger side low beam just quit working. Changed the bulb and checked the fuse. Still doesn't come on. Double checked the old and new bulbs, both measure resistance with my multimeter, so they should be good. Measured the fuse in the dash fuse panel with the headlight switch on, voltage at both fuse terminal tops. Measured voltage at the bulb connector, only .7v there. Is there a relay somewhere for the headlights? I know there's the bcm relay box by the battery, does this manage headlight power as well?
First post here for me, but I've been viewing for about a year now. Thanks in advance for the assistance and thanks a ton for all the information here I've used this year! :confused: I am hoping you are using a ground separate from the wire at the headlight bulb connector? Check Illumination Control Module (ICM) pins 3 and 5 for the 12v (system voltage) heading to the bulbs when set for headlights to be on. If pin 3 is not hot and pin 5 is hot, you may need a new or replacement ICM module. If both pins 3 and 5 are hot, you have an open in the wiring harness from output pin 3 to the headlight connector. Hope this helps! :( . |
Re: Headlight low beam not working. Bulb and fuse are good.
Where is the ICM located?
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Re: Headlight low beam not working. Bulb and fuse are good.
Originally Posted by Chiver79
(Post 915985)
Where is the ICM located?
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Re: Headlight low beam not working. Bulb and fuse are good.
Originally Posted by Chiver79
(Post 915985)
Where is the ICM located?
:) It is the light switch, the whole assembly. Search ICM or light switch should help. Good luck! :) . |
Re: Headlight low beam not working. Bulb and fuse are good.
Pins 3 and 5 are hot with the switch in the on position. Looks like I may have to run a new wire. Is the firewall cable access under the driver side fuse box in the engine bay?
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Re: Headlight low beam not working. Bulb and fuse are good.
Originally Posted by Chiver79
(Post 916124)
Pins 3 and 5 are hot with the switch in the on position. Looks like I may have to run a new wire. Is the firewall cable access under the driver side fuse box in the engine bay?
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Re: Headlight low beam not working. Bulb and fuse are good.
In a word, Squirrels may be your issue, wire chewed?? Do you have any rodent tracks, nuts , in the engine bay?? Woody I have lost on several vehicles turn signals, ABS wiring, and fuel pump connector....
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Re: Headlight low beam not working. Bulb and fuse are good.
Originally Posted by waldig
(Post 916155)
In a word, Squirrels may be your issue, wire chewed?? Do you have any rodent tracks, nuts , in the engine bay?? Woody I have lost on several vehicles turn signals, ABS wiring, and fuel pump connector....
My wife saw a Jeep and the engine bay was so packed with pine cones that the engine was not visible, two garbage cans of cones were removed from it. The owner never lifted the hood and just said it was running rough when he drove it into the dealership. |
Re: Headlight low beam not working. Bulb and fuse are good.
Lol, no signs of rodents...
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Re: Headlight low beam not working. Bulb and fuse are good.
Originally Posted by ala_xfire
(Post 915930)
No, not the INTERNAL bulb connector, measure at the connector that goes to the headlight.
https://cimg2.ibsrv.net/gimg/www.cro...da3d387fb9.png Conclusion: My open circuit is in the headlight assembly. How difficult is the headlight assembly to open up? I already understand the difficulty of removing it, as I had to adjust the driver side a few months ago from the under bolts. It required removing the inside fender wall. |
Re: Headlight low beam not working. Bulb and fuse are good.
I would not try opening it up, I would run 2 wires from the headlight connector to an H7 connector through the rubber seal cap.
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Re: Headlight low beam not working. Bulb and fuse are good.
Originally Posted by ala_xfire
(Post 916249)
I would not try opening it up, I would run 2 wires from the headlight connector to an H7 connector through the rubber seal cap.
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Re: Headlight low beam not working. Bulb and fuse are good.
Originally Posted by Chiver79
(Post 916251)
Saves me a day of work and no risk of screwing up the assembly. Great advice! Thanks!
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