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

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SECURITY INDICATOR LIGHT: 11, DTC: B10D9:87/P1260:00 [START STOP UNIT]

Description	Coil antenna (built into push button start) error
Detection condition	Start stop unit detected a malfunction in the coil antenna, and remote transmitter communication is not possible.
Fail-safe	Not applicable
Possible cause	Push button start connector or terminal malfunction Start stop unit connector or terminal malfunction Short to ground in wiring harness between the following terminals: Start stop unit terminal 1AC—Push button start terminal A Start stop unit terminal 1AE—Push button start terminal B Open circuit in wiring harness between the following terminals: Start stop unit terminal 1AC—Push button start terminal A Start stop unit terminal 1AE—Push button start terminal B Coil antenna 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 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.
3	INSPECT COIL ANTENNA CIRCUIT FOR SHORT TO GROUND Verify that the push button start and start stop unit connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side) and body ground: Push button start terminal A Push button start terminal B Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: Start stop unit terminal 1AC—Push button start terminal A Start stop unit terminal 1AE—Push button start 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. 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 COIL ANTENNA CIRCUIT FOR OPEN CIRCUIT Verify that the push button start and start stop unit connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side): Start stop unit terminal 1AC—Push button start terminal A Start stop unit terminal 1AE—Push button start terminal B 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 the following terminals: Start stop unit terminal 1AC—Push button start terminal A Start stop unit terminal 1AE—Push button start 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 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	VERIFY IF MALFUNCTIONING LOCATION IS COIL ANTENNNA DEPENDING ON REPEATABILITY Always reconnect all disconnected connectors. Remove the ROOM 25 A fuse. 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].) Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) Is the security indicator light: 11, DTC B10D9:87/P1260:00 displayed?	Yes	Replace the push button start, then go to the next step. (See PUSH BUTTON START REMOVAL/INSTALLATION.)
		No	Go to Step 7.
6	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Always reconnect all disconnected connectors. Remove the ROOM 25 A fuse. 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].) Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) Is the security indicator light: 11, DTC B10D9:87/P1260:00 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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