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2008 - MX-5 - Brakes

NO.6 BRAKE SYSTEM WARNING LIGHT STAYS ON 4 S OR MORE WHEN IGNITION SWITCH TURNED TO ON POSITION



6

BRAKE system warning light stays on 4 s or more when the ignition switch is turned to the ON position. (Parking brake is released.)

[TROUBLESHOOTING HINTS]

  • Malfunction of instrument cluster or ABS HU/CM

  • Short to ground in circuit in parking brake switch and/or brake fluid level sensor


Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT BRAKE FLUID LEVEL
  • Is brake fluid level normal?

Yes

Go to the next step.

No

Add brake fluid.

*2

INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY AND SHORTS
  • Monitor the one or more items of ABS HU/CM using the M-MDS datalogger function.

  • Is error message displayed regarding communication between ABS HU/CM and M-MDS?

Yes

If a communication error message is displayed even after inspecting according to procedures displayed on M-MDS.

Go to next Step 6.

No

Go to the next step.

3

INSPECT FOR DTCs IN ABS HU/CM
  • Have DTCs been stored in memory?

Yes

Perform the applicable DTC inspection.

(See ON-BOARD DIAGNOSIS[ABS].)

No

Go to the next step.

4

INSPECT WARNING LIGHT OPERATION
  • Does the warning light illuminate?

Yes

Go to the next step.

No

Replace the instrument cluster.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

5

VERIFY WHETHER MALFUNCTION IS IN PARKING BRAKE SWITCH OR BRAKE FLUID LEVEL SENSOR, OR IN SOME OTHER PART
  • Disconnect in the following order:

    1. Parking brake switch connector

    2. Brake fluid level sensor connector

  • Does the BRAKE system warning light go out with ignition switch turned to the ON position?

Yes

Replace the parking brake switch and/or brake fluid level sensor (Short with some internal part).

(See MASTER CYLINDER REMOVAL/INSTALLATION.)

(See PARKING BRAKE LEVER REMOVAL/INSTALLATION.)

No

Perform the following inspections. Repair if necessary.

  • Short to ground in the wiring harness between the instrument cluster (BRAKE system warning light) and parking brake switch.

  • Short to ground in the wiring harness between the instrument cluster (BRAKE system warning light) and brake fluid level sensor.

If inspection results are okay, replace the ABS HU/CM.

(See ABS HU/CM REMOVAL/INSTALLATION.)

*6

INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY
  • Disconnect the ABS HU/CM connector.

  • Is there continuity between connector terminal Z, Y and DLC-2?

Yes

Go to the next step.

No

Repair the wiring harness between the ABS HU/CM and DLC-2.

*7

INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO B+
  • Is the voltage approx. 12 V at connector terminal Z, Y?

Yes

Repair the wiring harness between the ABS HU/CM and DLC-2.

No

Go to the next step.

*8

INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO GROUND
  • Is there continuity between connector terminal Z, Y and ground?

Yes

Repair the wiring harness between the ABS HU/CM and DLC-2.

No

Replace the ABS HU/CM (communication circuit malfunction in ABS HU/CM).

(See ABS HU/CM REMOVAL/INSTALLATION.)




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