Possible Causes
WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
- Brake switch malfunction
- Open circuit in Green/Yellow wire between brake switch 4-pin harness connector terminal "D" and PCM 30-pin harness connector terminal "1K".
- Open circuit in Green/White wire between positive battery terminal and brake switch 4-pin harness connector terminal "B".
- PCM malfunction
- Poor connection of brake switch or PCM harness connectors.
- Short circuit to power in Green/Yellow wire between brake switch harness connector terminal "D" and PCM 30-pin harness connector terminal "1K".