Fbody interior LED-strip wiring
Basically, the BCM provides constant power except when the battery protector circuit shuts it down to prevent draining the battery if a door is left open or the map lights are left on. The courtesy function is controlled entirely by the ground side. The BCM provides ground when the lights first go on (a door is opened) and then gradually reduces the ground (increases the resistance) to create the theater dimming effect.
The map lights use the same power feed from the BCM but the switches in the mirror route the ground directly to a chassis ground making the lights stay on a full brightness until either the switch is turned off or the BCM cuts the power for the battery saver.
The wires to accomplish all this are available at any of the courtesy lights (mirror, dome, hatch in a coupe) as well as at the BCM behind the glovebox. The dark blue with white wire in the black 6-pin connector at the BCM provides the power. The white wire in the blue 32-pin connector at the BCM provides the variable ground. Splicing your LED strip wires (probably red for power and black for ground) into the corresponding wires at the BCM will make the strips work like the courtesy lights. You will need some kind of switch in the ground side to be able to turn them on at other times.
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Basically, the BCM provides constant power except when the battery protector circuit shuts it down to prevent draining the battery if a door is left open or the map lights are left on. The courtesy function is controlled entirely by the ground side. The BCM provides ground when the lights first go on (a door is opened) and then gradually reduces the ground (increases the resistance) to create the theater dimming effect.
The map lights use the same power feed from the BCM but the switches in the mirror route the ground directly to a chassis ground making the lights stay on a full brightness until either the switch is turned off or the BCM cuts the power for the battery saver.
The wires to accomplish all this are available at any of the courtesy lights (mirror, dome, hatch in a coupe) as well as at the BCM behind the glovebox. The dark blue with white wire in the black 6-pin connector at the BCM provides the power. The white wire in the blue 32-pin connector at the BCM provides the variable ground. Splicing your LED strip wires (probably red for power and black for ground) into the corresponding wires at the BCM will make the strips work like the courtesy lights. You will need some kind of switch in the ground side to be able to turn them on at other times.











