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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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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		Refer to “Fail-safe function table”. (See DTC TABLE [DSC HU/CM].)
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 Using the M-MDS, perform the instrument cluster DTC inspection. (See DTC INSPECTION [INSTRUMENT CLUSTER].) Are any DTCs present?	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 Inspect the DSC OFF switch. (See DSC OFF SWITCH INSPECTION.) Is the DSC OFF switch normal?	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 Reconnect all disconnected connectors. Using the M-MDS, clear the DTC from the DSC HU/CM. (See CLEARING DTC [DSC HU/CM].) Using the M-MDS, perform the DSC HU/CM DTC inspection. (See DTC INSPECTION [DSC HU/CM].) Is the same DTC present?	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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