Chevy and GMC Duramax Diesel Forum - View Single Post - LMM Fog Light Circuit Diagram?
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post #5 of (permalink) Old 03-01-2010, 07:47 PM
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Join Date: Jan 2010
Location: St. Louis, MO
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The logic resides in the BCM. Here's the Headlight Circuit Diagram. Check the volatage going into the BCM (lower left side of dash) on the orange wire 192 going into position 21x3 and coming out on the dark green/black wire 1317 from position 11x4. If you bypass the BCM by connecting those two wires directly, you should get what you are aiming for.

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