on the '97 its "BREAK LIGHT CIRCUIT". Easy fix if its the brake light switch. TO diagnois do the following:
Start the car. Tune the radio to any AM station and put the volume so you can hear the station.
SLOWLY depress the brake pedal. You will hear (in the radio) a static noise as you depress the brake pedal. If you hear this then you brake light switch is most likely the cause of the code.
The switch is not really "BAD", the brake lights still come on but what is happening is the contacts inside the switch are burnt. In other words, when the pedal is pushed, the metal blades in the switch make contact. This contact causes a small arch which results in carbon building up on the contacts. This arch is what you hear in the radio. The computer is simply picking up on this arch and throwing a "Brake Light Circuit" code to the display.
The switch was only availble from dealer or web OEM parts guy. $25-$35 bucks. There are 2 parts numbers for my '97. The install is easy, access is the hardest part. I have replaced mine twice and ended up destroying the old one getting it out. There is a compression/ratchet type holding mechanism that is easy to install but hard to remove (laying on my back blindly reaching under the panel.
2004 Lexus GX470
1989 Ford F250