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

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DTC B10C6:1F [START STOP UNIT]

Description	Keyless antenna (exterior, rear) circuit malfunction
Detection condition	Start stop unit detects an open circuit or short to ground in the keyless antenna (exterior, rear) circuit with the ignition switched off.
Fail-safe	Inhibits the door lock/unlock control using the advanced keyless entry system.
Possible cause	Keyless antenna (exterior, rear) connector or terminal malfunction LF control unit connector or terminal malfunction Short to ground in wiring harness between the following terminals: LF control unit terminal W—Keyless antenna (exterior, rear) terminal B LF control unit terminal X—Keyless antenna (exterior, rear) terminal A Open circuit in wiring harness between the following terminals: LF control unit terminal W—Keyless antenna (exterior, rear) terminal B LF control unit terminal X—Keyless antenna (exterior, rear) terminal A LF control unit malfunction Keyless antenna (exterior, rear) malfunction Start stop unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT KEYLESS ANTENNA (EXTERIOR, REAR) CONNECTOR CONDITION Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Disconnect the keyless antenna (exterior, rear) 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 7.
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 7.
3	INSPECT KEYLESS ANTENNA (EXTERIOR, REAR) CIRCUIT FOR SHORT TO GROUND Verify that the LF control unit and keyless antenna (exterior, rear) connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side) and body ground: Keyless antenna (exterior, rear) terminal B Keyless antenna (exterior, rear) terminal A Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: LF control unit terminal W—Keyless antenna (exterior, rear) terminal B LF control unit terminal X—Keyless antenna (exterior, rear) terminal A 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 7.
		No	Go to the next step.
4	INSPECT KEYLESS ANTENNA (EXTERIOR, REAR) CIRCUIT FOR OPEN CIRCUIT Verify that the LF control unit and keyless antenna (exterior, rear) connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side): LF control unit terminal W—Keyless antenna (exterior, rear) terminal B LF control unit terminal X—Keyless antenna (exterior, rear) terminal A 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: LF control unit terminal W—Keyless antenna (exterior, rear) terminal B LF control unit terminal X—Keyless antenna (exterior, rear) terminal A 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 7.
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 Step 7. (See LF CONTROL UNIT REMOVAL/INSTALLATION.)
6	VERIFY IF MALFUNCTIONING LOCATION IS KEYLESS ANTENNA (EXTERIOR, REAR) DEPENDING ON REPEATABILITY 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].) Perform the following work: Switch the ignition off. Open the door (LH). Close all the doors and trunk. Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) Is the same DTC displayed?	Yes	Replace the keyless antenna (exterior, rear), then go to the next step. (See KEYLESS ANTENNA REMOVAL/INSTALLATION.)
		No	Go to Step 8.
7	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].) Perform the following work: Switch the ignition off. Open the door (LH). Close all the doors and trunk. 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.
8	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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