DTC C0023-14: Brake Light Circuit Malfunction: Notes

WARNING: This page is about a different car, the 2016 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

Description	Brake light circuit malfunction
Detection condition	Rear body control module (RBCM) detects any of the following conditions: Brake lights/high-mount brake light illuminated even though driver or system does not illuminate brake lights/high-mount brake lights. Brake lights/high-mount brake light not illuminated even though driver depresses brake pedal. Brake lights/high-mount brake light not illuminated even though system illuminates brake lights/high-mount brake light.
Fail-safe function	Not applicable
Possible cause	Brake light bulb (LH) malfunction Brake light bulb (RH) malfunction High-mount brake light connector or terminal malfunction Brake light (LH) connector or terminal malfunction Brake light (RH) connector or terminal malfunction Rear body control module (RBCM) connector or terminal malfunction Short to ground in wiring harness between the following terminals: Rear body control module (RBCM) terminal 4D-Brake light (LH) terminal B Rear body control module (RBCM) terminal 4D-Brake light (RH) terminal B Rear body control module (RBCM) terminal 4D-High-mount brake light terminal A Short to power supply in wiring harness between the following terminals: Rear body control module (RBCM) terminal 4D-Brake light (LH) terminal B Rear body control module (RBCM) terminal 4D-Brake light (RH) terminal B Rear body control module (RBCM) terminal 4D-High-mount brake light terminal A Open circuit in wiring harness between the following terminals: Rear body control module (RBCM) terminal 4D-Brake light (LH) terminal B Rear body control module (RBCM) terminal 4D-Brake light (RH) terminal B Rear body control module (RBCM) terminal 4D-High-mount brake light terminal A High-mount brake light malfunction Brake light (LH) malfunction Brake light (RH) malfunction Rear body control module (RBCM) malfunction