DTC C0023-14; Brake Light Circuit Malfunction: Notes
DETECTION CONDITION AND POSSIBLE CAUSES
| 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.
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| Fail-safe function |
Not applicable |
| Possible cause |
- Rear combination light (LH) connector or terminal malfunction
- Open circuit in wiring harness between rear combination light (LH) terminal F and body ground
- Rear combination light (RH) connector or terminal malfunction
- Open circuit in wiring harness between rear combination light (RH) terminal F and body ground
- Liftgate light (LH) connector or terminal malfunction
- Open circuit in wiring harness between rear liftgate light (LH) terminal D and body ground
- Liftgate light (RH) connector or terminal malfunction
- Open circuit in wiring harness between rear liftgate light (RH) terminal D and body ground
- High-mount brake light connector or terminal malfunction
- Open circuit in wiring harness between high-mount brake light terminal A and body ground
- Brake light unit 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-Rear combination light (LH) terminal B
- Rear body control module (RBCM) terminal 4D-Rear combination light (RH) terminal B
- Rear body control module (RBCM) terminal 4D-Liftgate light (LH) terminal C
- Rear body control module (RBCM) terminal 4D-Liftgate light (RH) terminal C
- Rear body control module (RBCM) terminal 4D-Brake light unit terminal J
- High-mount brake light terminal B-Brake light unit terminal G
- Short to power supply in wiring harness between the following terminals:
- Rear body control module (RBCM) terminal 4D-Rear combination light (LH) terminal B
- Rear body control module (RBCM) terminal 4D-Rear combination light (RH) terminal B
- Rear body control module (RBCM) terminal 4D-Liftgate light (LH) terminal C
- Rear body control module (RBCM) terminal 4D-Liftgate light (RH) terminal C
- Rear body control module (RBCM) terminal 4D-Brake light unit terminal J
- High-mount brake light terminal B-Brake light unit terminal G
- Open circuit in wiring harness between the following terminals:
- Rear body control module (RBCM) terminal 4D-Rear combination light (LH) terminal B
- Rear body control module (RBCM) terminal 4D-Rear combination light (RH) terminal B
- Rear body control module (RBCM) terminal 4D-Liftgate light (LH) terminal C
- Rear body control module (RBCM) terminal 4D-Liftgate light (RH) terminal C
- Rear body control module (RBCM) terminal 4D-Brake light unit terminal J
- High-mount brake light terminal B-Brake light unit terminal G
- Liftgate light (LH) malfunction
- Liftgate light (RH) malfunction
- Rear combination light (LH) malfunction
- Rear combination light (RH) malfunction
- High-mount brake light malfunction
- Brake light unit malfunction
- Rear body control module (RBCM) malfunction
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Courtesy of MAZDA MOTORS CORP.