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2008 - MX-5 - Brakes

DTC B1484, C1954 [DYNAMIC STABILITY CONTROL (DSC)]



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

  • Brake switch malfunction

  • Open circuit in the wiring harness between the DSC HU/CM terminal N 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 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

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

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 ON-BOARD DIAGNOSIS[DYNAMIC STABILITY CONTROL (DSC)].)

No

DTC troubleshooting completed.




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