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

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DTC B10BE:12, B10BE:13 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

DESCRIPTION	B10BE:12 Solar radiation sensor circuit short to power supply B10BE:13 Solar radiation sensor circuit open
DETECTION CONDITION	Malfunction in wiring harness between solar radiation sensor and climate control unit
FAIL-SAFE FUNCTION	Malfunction determined when IG SW at ON The solar radiation sensor input value is fixed at the value directly before the malfunction only when the valve is 1,450 W/m² or more. Malfunction already exists when IG SW turned to ON Solar radiation sensor value is fixed at 0 W/m².
POSSIBLE CAUSE	Solar radiation sensor connector malfunction Solar radiation sensor malfunction Open circuit in wiring harness between climate control unit and solar radiation sensor Short to power supply in wiring harness between climate control unit and solar radiation sensor Climate control unit connector malfunction Climate control unit malfunction
SYSTEM WIRING DIAGRAM

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT SOLAR RADIATION SENSOR CONNECTOR Switch the ignition to off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Disconnect the solar radiation sensor connector. Inspect the connector and terminals (corrosion, damage, pin disconnection). Are the connector and terminals normal?	Yes	Go to the next step.
		No	Repair/replace the connector or terminal. After repair procedure, go to the next step.
2	INSPECT SOLAR RADIATION SENSOR Inspect the solar radiation sensor. (See SOLAR RADIATION SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].) Is it normal?	Yes	Go to the next step.
		No	Replace the solar radiation sensor. (See SOLAR RADIATION SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) Go to the next step.
3	INSPECT SOLAR RADIATION SENSOR CIRCUIT FOR OPEN CIRCUIT Disconnect the climate control unit connector and the solar radiation sensor connector. Is there continuity between the following terminals of the climate control unit and the solar radiation sensor? H???A K???B	Yes	Go to the next step.
		No	Repair the wiring harness. Go to the next step.
4	INSPECT SOLAR RADIATION SENSOR CIRCUIT FOR SHORT TO POWER SUPPLY Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Switch the ignition to ON. Measure the voltage of solar radiation sensor connector terminals A and B of solar radiation sensor harness side connector. Is the voltage measured?	Yes	Repair the wiring harness. Go to the next step.
		No	Go to the next step.
5	VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION Switch the ignition to off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Inspect the connector and terminals (corrosion, damage, pin disconnection). Are the connector and terminals normal?	Yes	Go to the next step.
		No	Repair/replace the malfunctioning vehicle wiring harness, connector, or terminal. After repair procedure, go to the next step.
6	VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN Reconnect the disconnected connectors. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Switch the ignition to ON. Clear the DTC for the climate control unit using the M-MDS. (See CLEARING DTC [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) Perform the DTC inspection for the climate control unit using the M-MDS. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) Is the same DTCs present?	Yes	Repeat the inspection from Step 1. If the malfunction does not recur, go to the next step. If the malfunction recurs, replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) Go to the next step.
		No	Go to the next step.
7	VERIFY THAT NO OTHER DTCs ARE PRESENT Verify other DTCs displayed. Are any other DTCs output?	Yes	Perform the corresponding DTC inspection.
		No	DTC troubleshooting completed.

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