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

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DTC B10D1:23 [START STOP UNIT]

Description	Request switch (LF) circuit malfunction
Detection condition	Start stop unit detected any of the following conditions at a vehicle speed of 5 km/h {3 mph} or more. The request switch (LF) is continuously ON for 2 min or more. The request switch (LF) was ON 7 times.
Fail-safe	Not applicable
Possible cause	Outer Handle (LH) connector or terminal malfunction LF control unit connector or terminal malfunction Short to ground in wiring harness between LF control unit terminal C and outer handle (LH) terminal D Request switch (LF) malfunction LF control unit malfunction Start stop unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT OUTER HANDLE (LH) CONNECTOR CONDITION Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Disconnect the outer handle (LH) 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 LF CONTROL UNIT CONNECTOR CONDITION Disconnect the LF control 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.
3	INSPECT REQUEST SWITCH (LF) CIRCUIT FOR SHORT TO GROUND Verify that the LF control unit and outer handle (LH) connectors are disconnected. Inspect for continuity between outer handle (LH) terminal D (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 LF control unit terminal C and outer handle (LH) terminal D. 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 Step 6.
		No	Go to the next step.
4	INSPECT REQUEST SWITCH (LF) Inspect the request switch (LF). (See REQUEST SWITCH INSPECTION.) Is the request switch (LF) normal?	Yes	Go to the next step.
		No	Replace the outer handle (LH), then go to Step 6. (See OUTER HANDLE REMOVAL/INSTALLATION.)
5	INSPECT LF CONTROL UNIT Inspect the LF control unit. (See LF CONTROL UNIT INSPECTION.) Is the LF control unit normal?	Yes	Go to the next step.
		No	Replace the LF control unit, then go to the next step. (See LF CONTROL UNIT 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].) Drive the vehicle at 5 km/h {3 mph} or more for 2 min 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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