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

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DTC B108C:24 [START STOP UNIT]

Description	Push button start switch 2 circuit malfunction
Detection condition	Start stop unit detects that the push button start switch 2 is kept in an off condition 5 times or more even though the push button start switch 1 is on.
Fail-safe	Not applicable
Possible cause	Push button start connector or terminal malfunction Open circuit in wiring harness between push button start terminal E and body ground Start stop unit connector or terminal malfunction Open circuit in wiring harness between start stop unit terminal 2J and push button start terminal I Push button start switch 2 malfunction Start stop unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT PUSH BUTTON START CONNECTOR CONDITION Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Disconnect the push button start 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 6.
2	INSPECT PUSH BUTTON START SWITCH 2 GROUND CIRCUIT FOR OPEN CIRCUIT Verify that the push button start connector is disconnected. Inspect for continuity between push button start terminal E (wiring harness-side) and body ground. Is there continuity?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between push button start terminal E and body ground. 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 an open circuit. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has an open circuit. Go to Step 6.
3	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 6.
4	INSPECT PUSH BUTTON START SWITCH 2 CIRCUIT FOR OPEN CIRCUIT Verify that the push button start and start stop unit connectors are disconnected. Inspect for continuity between start stop unit terminal 2J (wiring harness-side) and push button start terminal I (wiring harness-side). Is there continuity?	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 2J and push button start terminal I. 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 an open circuit. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has an open circuit. Go to Step 6.
5	INSPECT PUSH BUTTON START SWITCH 2 Inspect the push button start switch 2. (See PUSH BUTTON START INSPECTION.) Is the push button start switch 2 normal?	Yes	Go to the next step.
		No	Replace the push button start, then go to the next step. (See PUSH BUTTON START REMOVAL/INSTALLATION.)
6	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 press the push button start 5 times 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.
7	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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