The ground wire will be black/white or black/yellow. The BCM power will be either a green/violet, white, green or yellow. If that doesn’t work, disconnect the electrical connector at the door latch and test for BCM power and ground. Shoot a light lubricating oil into the latch and open and close the door several times to work the lube into the pin switch. Fix door ajar light on Fordįirst, try lubricating the door ajar switch. If either the BCM signal or the ground wire breaks in the door hinge/jamb area (most likely place to break), the BCM won’t see the voltage drop and will turn the door ajar light on even if the door is closed. The BCM sees the voltage drop and turns off the door ajar light. When the door is closed and the door ajar switch is operating properly, the switch is closed and the BCM power is connected to ground. The body control module sends power to the door ajar switch on the green/violet wire. It’s a really stupid location because dirt and grease that falls into the latch can really much up the pin switch.
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