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2008 - MX-5 - Brakes

NO.1 NEITHER ABS WARNING LIGHT NOR BRAKE SYSTEM WARNING LIGHT ILLUMINATE WHEN THE IGNITION SWITCH IS TURNED TO THE ON POSITION



1

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

[TROUBLESHOOTING HINTS]

  • Malfunction of instrument cluster or ABS HU/CM

  • Improper configuration (instrument cluster)

STEP

INSPECTION

ACTION

1

VERIFY WHETHER MALFUNCTION IS IN COMMON POWER SUPPLY OF WARNING LIGHTS AND INDICATOR LIGHTS, OR IN OTHER WARNING LIGHTS AND INDICATOR LIGHTS
  • Do other warning and indicator lights illuminate when the ignition switch is turned to the ON position?

Yes

Go to step 4.

No

Go to the next step.

2

INSPECT INSTRUMENT CLUSTER POWER SUPPLY FUSE
  • Is the instrument cluster ignition power supply fuse normal?

Yes

Go to the next step.

No

Inspect for a short to ground on the circuit with the blown fuse.

Repair or replace if necessary.

Install appropriate amperage fuse.

*3

VERIFY WHETHER MALFUNCTION IS IN WIRING HARNESS (INSPECT FOR CONTINUITY BETWEEN INSTRUMENT CLUSTER POWER SUPPLY AND INSTRUMENT CLUSTER) OR INSTRUMENT CLUSTER
  • Turn the ignition switch to the ON position.

  • Measure the voltage at instrument cluster connector (12-pin) terminal 1G.

  • Is the voltage approx. 12 V?

Yes

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

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

No

Inspect for an open circuit between the instrument cluster and ground.

Repair or replace if necessary.

4

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 Step 6.

5

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 network communication for related system malfunction.

Repair or replace if necessary.

6

CONFIRM DTC B2477 FOR INSTRUMENT CLUSTER USING M-MDS
  • Is DTC B2477 retrieved?

Yes

Perform instrument cluster configuration.

(See INSTRUMENT CLUSTER CONFIGURATION.)

No

Replace the ABS HU/CM.

(See ABS HU/CM REMOVAL/INSTALLATION.)




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