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2008 - MX-5 - Brakes

NO.3 BRAKE SYSTEM WARNING LIGHT DOES NOT ILLUMINATE WHEN THE IGNITION SWITCH IS TURNED TO THE ON POSITION



3

BRAKE system warning light does not illuminate when the ignition switch is turned to the ON position.

[TROUBLESHOOTING HINTS]

  • Malfunction of instrument cluster or ABS HU/CM


Diagnostic procedure

STEP

INSPECTION

ACTION

1

CONFIRM DTC U1900 USING M-MDS
  • Retrieve DTCs from the PCM, ABS and instrument cluster.

  • Is DTC U1900 retrieved?

Yes

Go to the next step.

No

Inspect the instrument cluster. If normal, go to the next step.

2

CONFIRM DTCS U0121, U0100 AND U0214 USING M-MDS:
  • Retrieve DTCs from the instrument cluster.

  • Are DTCs U0121, U0100 and U0214 retrieved?

Yes

Replace the instrument cluster (open circuit in instrument cluster).

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

No

Inspect the network communication for a related system malfunction.

Repair or replace if necessary.




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