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

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DTC B10AC:23 [START STOP UNIT]

Description	Cruise control switch circuit malfunction
Detection condition	Start stop unit detects any cruise control switch stuck on for 120 s or more with the ignition switched ON (engine off or on).
Fail-safe	Not applicable
Possible cause	Instrument cluster configuration error Clock spring connector or terminal malfunction Clock spring malfunction Start stop unit connector or terminal malfunction Short to ground in wiring harness between start stop unit terminal 1Y and clock spring terminal 1J Short to power supply in wiring harness between start stop unit terminal 1Y and clock spring terminal 1J Cruise control switch malfunction Start stop unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	PERFORM INSTRUMENT CLUSTER CONFIGURATION (USING AS-BUILT DATA) Using the M-MDS, perform the instrument cluster configuration (using As-Built data). (See INSTRUMENT CLUSTER CONFIGURATION (USING AS-BUILT DATA).) Clear the DTC for the start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT].) Switch the ignition ON (engine off or on) and wait for 120 s or more. Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) Is the same DTC displayed?	Yes	Using the M-MDS, perform the instrument cluster configuration (using As-Built data) again, then go to the next step. (See INSTRUMENT CLUSTER CONFIGURATION (USING AS-BUILT DATA).)
		No	Go to Step 9.
2	INSPECT CLOCK SPRING CONNECTOR CONDITION Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Disconnect the clock spring connector. Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. Is the connector normal?	Yes	Go to the next step.
		No	Repair or replace the connector, then Go to Step 8.
3	INSPECT CLOCK SPRING Inspect the clock spring. (See CLOCK SPRING INSPECTION [STANDARD DEPLOYMENT CONTROL SYSTEM].) (See CLOCK SPRING INSPECTION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) Is the clock spring normal?	Yes	Go to the next step.
		No	Replace the clock spring, then Go to Step 8. (See CLOCK SPRING REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].) (See CLOCK SPRING REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)
4	INSPECT START STOP UNIT CONNECTOR CONDITION Disconnect the start stop unit connector. Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. Is the connector normal?	Yes	Go to the next step.
		No	Repair or replace the connector, then Go to Step 8.
5	INSPECT CRUISE CONTROL SWITCH CIRCUIT FOR SHORT TO GROUND Verify that the start stop unit and clock spring connectors are disconnected. Inspect for continuity between clock spring terminal 1J (wiring harness-side) and body ground. Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between start stop unit terminal 1Y and clock spring terminal 1J. 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. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground. Go to the next step.
		No	Go to the next step.
6	INSPECT CRUISE CONTROL SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY Verify that the start stop unit and clock spring connectors are disconnected. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Switch the ignition ON (engine off or on). Measure the voltage at the clock spring terminal 1J (wiring harness-side). Is the voltage 0 V?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between start stop unit terminal 1Y and clock spring terminal 1J. 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 power supply. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to power supply. Go to Step 8.
7	INSPECT CRUISE CONTROL SWITCH Inspect the cruise control switch. (See CRUISE CONTROL SWITCH INSPECTION [SKYACTIV-G 2.0].) Is the cruise control switch normal?	Yes	Go to the next step.
		No	Replace the cruise control switch, then go to the next step. (See STEERING SWITCH REMOVAL/INSTALLATION.)
8	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Always reconnect all disconnected connectors. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Clear the DTC for the start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT].) Switch the ignition ON (engine off or on) and wait for 120 s or more. Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the start stop unit. (See START STOP UNIT REMOVAL/INSTALLATION.) Go to the next step.
		No	Go to the next step.
9	VERIFY IF OTHER DTCs DISPLAYED Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [START STOP UNIT].)
		No	DTC troubleshooting completed.

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