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DTC C1109:64 [DSC HU/CM]

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2016 – MX-5 – Brakes

DTC C1109:64 [DSC HU/CM]

DTC

C1109:64

DSC OFF switch

DETECTION CONDITION

  • DSC OFF is switched ON continuously for 10 s or more is detected.

FAIL-SAFE FUNCTION

POSSIBLE CAUSE

  • The DSC OFF switch is pressed and held for 10 s or more

  • Short to ground circuit in wiring harness between instrument cluster terminal V and cluster switch terminal B

  • DSC OFF switch malfunction

  • Poor connection at each connector

  • DSC HU/CM malfunction

Diagnostic Procedure

Step

Inspection

Action

1

VERIFY INSTRUMENT CLUSTER DTC

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [INSTRUMENT CLUSTER].)

DTC troubleshooting completed, then go to the next step.

No

Go to the next step.

2

INSPECT DSC OFF SWITCH CIRCUIT FOR SHORT TO GROUND CIRCUIT

  • Switch the ignition OFF.

  • Disconnect the cluster switch connector.

  • Inspect for continuity between cluster terminal B (wiring harness-side)—body ground

  • Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between instrument cluster terminal V—cluster switch terminal B.

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground circuit.

  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has a short to ground circuit.

Go to Step4.

No

Go to the next step.

3

INSPECT DSC OFF SWITCH

Yes

Go to the next step.

No

Replace the DSC OFF switch, then go to the next step.

(See DSC OFF SWITCH REMOVAL/INSTALLATION.)

4

VERIFY DTC TROUBLESHOOTING COMPLETED

Yes

Repeat the inspection from Step1.

If the malfunction recurs, replace the DSC HU/CM, then go to the next step.

(See DSC HU/CM REMOVAL/INSTALLATION.)

No

Go to the next step.

5

VERIFY NO DTC IS PRESENT

  • Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [DSC HU/CM].)

No

DTC troubleshooting completed.

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