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

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DTC B1A61:11, B1A61:13 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

System malfunction location	B1A61:11: Passenger compartment temperature sensor circuit short to ground B1A61:13: Passenger compartment temperature sensor circuit open
Detection condition	Malfunction in wiring harness between passenger compartment temperature sensor and climate control unit
Fail-safe function	Malfunction determined when IG SW at ON Passenger compartment temperature sensor input value is fixed at 25 °C {77 °F}. Malfunction already exists when IG SW turned to ON Passenger compartment temperature sensor input value is fixed at the value right before the malfunction.
Possible cause	Connector or terminal malfunction Passenger compartment temperature sensor malfunction Open circuit in wiring harness between climate control unit and passenger compartment temperature sensor Short to ground in wiring harness between climate control unit and passenger compartment temperature sensor Climate control unit malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT PASSENGER COMPARTMENT TEMPERATURE SENSOR CONNECTOR Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Disconnect the passenger compartment temperature sensor connector. (See PASSENGER COMPARTMENT TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) 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 PASSENGER COMPARTMENT TEMPERATURE SENSOR Inspect the passenger compartment temperature sensor. (See PASSENGER COMPARTMENT TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].) Is it normal?	Yes	Go to the next step.
		No	Replace the passenger compartment temperature sensor. (See PASSENGER COMPARTMENT TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) Go to the next step.
3	INSPECT PASSENGER COMPARTMENT TEMPERATURE SENSOR CIRCUIT FOR OPEN CIRCUIT Disconnect the climate control unit connector. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) Disconnect the passenger compartment temperature sensor connector. (See PASSENGER COMPARTMENT TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) Inspect for continuity between the following terminals (wiring harness-side): Climate control unit terminal F???passenger compartment temperature sensor terminal A Climate control unit terminal E???passenger compartment temperature sensor 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 climate control unit terminal and passenger compartment temperature sensor terminal. 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 the next step.
4	INSPECT PASSENGER COMPARTMENT TEMPERATURE SENSOR CIRCUIT FOR SHORT TO GROUND Inspect for continuity between the following terminal (wiring harness-side) and body ground: Climate control unit terminal F Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and passenger compartment temperature sensor terminal. 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 the next step.
		No	Connect the climate control unit connector, then go to the next step.
5	VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION 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	INSPECT PASSENGER COMPARTMENT TEMPERATURE SENSOR CIRCUIT Connect the climate control unit connector. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Switch the ignition ON (engine off or on). Inspect the voltage at the following climate control unit terminal (wiring harness-side). Terminal F (passenger compartment temperature sensor input signal) Is the voltage normal? (Approx. 5 V)	Yes	The system is normal at present. Go to the next step.
		No	Go to the next step.
7	VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN Switch the ignition off. Disconnect the negative battery cable. Reconnect the disconnected connectors. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Clear the past malfunction from memory. (See CLEARING DTC [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) Verify DTCs. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) Is DTC B1A61:11 or B1A61:13 output?	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.
8	VERIFY THAT NO OTHER DTCs ARE PRESENT Verify other DTCs displayed. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) Are any other DTCs output?	Yes	Perform the corresponding DTC inspection. (See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
		No	DTC troubleshooting completed.

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