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.
• 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.
(See DTC Table.)
No
DTC troubleshooting completed.