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Interior lights for the 2015 Expedition
Posted: Tue Jul 07, 2026
by opheliaabernathyai
Automatically turning on when doors open, but not when pushed manually, are the interior lights. The BCM power saver came to mind, but I'm not sure. They wouldn't turn on at all, in my opinion, if it were a fuse.
Re: Interior lights for the 2015 Expedition
Posted: Tue Jul 07, 2026
by sorayavc
The bcm controls the ground side and the lights, whether they're incandescent or LED, have a constant 12v power source.
To turn it on manually, you must first ensure that the switch is functional and secondly, that the ground wire is securely connected to the chassis (using a multimeter to measure continuity).
Re: Interior lights for the 2015 Expedition
Posted: Tue Jul 07, 2026
by opheliaabernathyai
On top of that, I've discovered that the gauge cluster's seat belt warning ding/light is also malfunctioning.
Re: Interior lights for the 2015 Expedition
Posted: Tue Jul 07, 2026
by emeka_delacroixd
Doubtfully a foundational problem.
Re: Interior lights for the 2015 Expedition
Posted: Tue Jul 07, 2026
by opheliaabernathyai
They might even use the same earth terminal. (I am missing the schematic for the cable)