Question about 2003 Ford Crown Victoria

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Why do the headlight cut on and off on an 2003 ford crown victoria

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Hi,

When the problem is occurring, check the power feeds to the Lighting Control Module (LCM). At C2145c (16 terminal Grey connector) check pin 1 White/Violet (WH/VT) wire from fuse #15 and pin 9 Red/Yellow (RD/YE) wire from fuse #6 (both fuses are in the interior fuse panel) for battery voltage with the key on.

If OK, check on C2145b (16 terminal Black connector) pin 6 Orange/White (OG/WH) wire from fuse #27, pin 1 Light Green/Yellow (LG/YE) wire from fuse #23, and pin 12 Tan/White (TN/WH) wire from fuse #21 for battery voltage at all times. Also check pin 10 and 15 Black (BK) wires for good ground.

If the powers and grounds are good, verify the RD/YE wire at pin 10 of C2145c shows to be grounded with the headlight switch on through the headlight switch. Also check the power out to the headlights on pin 16 Gray (GY) wire of C2145b.

If all inputs are OK, but there is no power out on the headlight circuit, try to pull codes with a scanner when acting up. Address any lighting related codes as needed and recheck operation.

If all powers and grounds are OK, the headlight input is good, but the module is not powering the headlights, suspect a faulty LCM.

Let me know,if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Posted on May 01, 2010

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  • Master
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This sounds strongly like an issue with the headlamp switch internally. Replacement of the switch is going to be necessary. Let me know what else you need(instructions, diagrams, etc.).

Posted on May 01, 2010

  • Kori Policy
    Kori Policy May 02, 2010

    If you need a wiring diagram let me know. I have system diagrams for the entire car.

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