Mazda CX-9 Grand Touring 2009 Manual page 491

DTC C1446 [DSC/RSC]
DTC C1446 [DSC/RSC] DETECTION CONDITION AND POSSIBLE CAUSE
DTC C1446
DETECTION
CONDITION
POSSIBLE CAUSE
2008 Mazda CX-9 Grand Touring
2008 BRAKES On-Board Diagnostic (DSC/RSC) - Mazda CX-9
Brake switch system
Brake switch ON signal is not input when the brake fluid pressure sensor signal
reaches the specified value.
Brake switch ON signal is input even if the signal from the brake fluid pressure
sensor is less than the specification.
Open or short circuit in wiring harness between the brake switch and PCM 1T
terminal
Brake switch malfunction
Poor connection at connectors (female terminal)