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DTC B1484, C1953

BHE040243000W16

  Caution

  • If the battery voltage drops during the inspection, B1318 will be output as a current malfunction and the proper diagnosis cannot be made. Be careful not to let the battery voltage drop.

DTC | B1484, C1953 | Brake switch
DETECTION CONDITION | • B1484 – Open circuit in the wiring harness between the DSC HU/CM terminal and the brake switch terminal • C1953 – Brake switch ON signal is not input when the brake fluid pressure sensor signal reaches the specified value.
POSSIBLE CAUSE | • Brake switch malfunction • Open circuit in the wiring harness between the DSC HU/CM terminal AD and the brake switch terminal D

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 AD 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. (See BRAKE SWITCH INSPECTION.) • Is the brake switch normal? | Yes | Go to the next step.
No | Replace the brake switch, then go to the next step. (See BRAKE PEDAL REMOVAL/INSTALLATION.)
3 | VERIFY TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the memory. (See Clearing DTCs Procedures.) • Are the same DTCs present? | Yes | Replace the DSC HU/CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION.)
No | Go to the next step.
4 | VERIFY AFTER REPAIR PROCEDURE • Are any other DTC present? | Yes | Go to the applicable DTC inspection. (See DTC Table.)
No | DTC troubleshooting completed.