2004 headlights on/off wire signal

[intensifi]

Guessing it’s one of the wires on the FEM.

Needed for aftermarket Kenwood headunit to enable dimming the screen at night.

Illumination wire in factory harness appears to be variable based on illumination dial. I need 12V/0V for the Kenwood.

If it’s another pin on the factory harness, that would be ideal!

Thanks in advance.

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[Frankie the Fink]

Hmm....that thumbwheel on the dash sends a signal (a pulse-width modulated signal IIRC) to the FEM and that computer processes the signa thenl forwards the dimming signal to the lights. Its not straight forward (I don't have the schematics in front of me so I'm going from memory).

 

[doug7740]

doug7740
1955 Thunderbird Blue

 

[WesTxStoner425]

FYI @doug7740
Diagram appears a little blurry.

 

[doug7740]

Sorry the diagram was blurry.

The attached non-color version should be more clear.

doug7740
1955 Thunderbird Blue