DTC B1484, C1954


id040200800500

DTC
B1484, C1954
Brake switch system
DETECTION CONDITION
•  B1484
―  Open circuit in the wiring harness between the DSC HU/CM terminal and the brake switch terminal
•  C1954
―  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.
POSSIBLE CAUSE
•  Open circuit in the wiring harness between the DSC HU/CM terminal N and the brake switch terminal D
•  Brake switch malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
INSPECT DSC HU/CM TO BRAKE SWITCH FOR OPEN CIRCUIT
•  Turn the ignition switch off.
•  Disconnect the DSC HU/CM and brake switch connector.
•  Inspect for continuity DSC HU/CM terminal N and brake switch terminal D.
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit between DSC HU/CM and brake switch, then go to the next step.
2
INSPECT BRAKE SWITCH
•  Inspect the brake switch.
•  Is the brake switch normal?
Yes
Go to the next step.
No
Replace the brake switch, then go to the next step.
3
VERIFY TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the memory.
•  Are the same DTCs present?
Yes
Replace the DSC HU/CM, then go to the next step.
No
Go to the next step.
4
VERIFY AFTER REPAIR PROCEDURE
•  Are any other DTC present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.