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!

 

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.

 

The connector is reading .07v

 

No, not the INTERNAL bulb connector, measure at the connector that goes to the headlight.

 

Voltage low there too

 

Then unfortunately you have a wiring problem, as you have most likely already concluded.

 

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!

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Where is the ICM located?

 

The ICM is just another name for the headlight switch assembly.

 

It is the light switch, the whole assembly. Search ICM or light switch should help. Good luck!

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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?

 

 

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....

 

 

Lol, no signs of rodents...

 

Just realized the pin assignments are actually flipped from the above pic when looking at the connector from the front. Yellow is in the top left position, which has voltage.

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.

 

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.

 

Saves me a day of work and no risk of screwing up the assembly. Great advice! Thanks!

 

No problem, good luck !