Hi,
Is it only the brake lights that aren't working? Do the turn signals, parking lamps, backup lamps, and license plate lamps work? I ask because there could be a ground-related issue.
I ask because the center high-mount stop lamp (CHMSL) is powered via a relay. It also has its own separate fuse.
Next, if the turn signals work, then the wiring to the light sockets is good because the signals use the same wires.
That leaves the body control module. Do me a favor. See if there is power to the yellow wires at the light sockets when the brake pedal is pressed. Don't use a 9v battery.
I attached the wiring schematic below showing the exterior lighting circuits. I highlighted areas of interest. I need to know if there is power. If there isn't, we will need to work backward to see where power is lost.
Let me know.
Joe
See pics below.
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Saturday, November 11th, 2023 AT 9:31 PM