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1998 Firebird Headlight Modification
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Relay Controls Headlight Door Control Module
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The wire from the console switch connects to a double pole double throw 12v relay. The headlight door control module (DCM) is located on the drivers side of the car next to the radiator. The factory light yellow wire is powered on with the headlights, the brown wire is powered on with the parking lights. The light yellow and brown wires are cut and connected to the relay so that in its normally closed position the original circuit is maintained. When 12v is applied by turning on the switch in the console, the relay opens the light yellow and brown circuit, and applies power to the light yellow (headlight feed) only connected to the DCM, but isolates the DCM from the headlight switch on the dash. This causes the headlight doors to open as if the headlights were turned on, even though the headlights are off. When the console switch is turned off, the relay switches back to its normally closed setting, and the headlights work normally with the headlight switch.
The relay is a common Radio Shack component. Its held in place with wire ties around the DCM.
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