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

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DTC B13AA:71 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

System malfunction location	Air mix actuator motor lock
Detection condition	Air mix actuator motor lock
Fail-safe function	Malfunction determined when IG SW at ON Air mix actuator drive signal is stopped right when the malfunction is determined. Malfunction already exists when IG SW turned to ON Twenty seconds after the ignition is switched ON, the air mix actuator drive signal is output normally again. Afterwards, motor output is stopped during malfunction determination.
Possible cause	Connector or terminal malfunction Air mix actuator malfunction A/C unit (air mix link and air mix crank) malfunction Open circuit in wiring harness between climate control unit and air mix actuator Short to ground in wiring harness between climate control unit and air mix actuator Climate control unit malfunction

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	INSPECT AIR MIX ACTUATOR CONNECTOR Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Disconnect the air mix actuator connector. (See AIR MIX ACTUATOR 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 AIR MIX ACTUATOR Inspect the air mix actuator. (See AIR MIX ACTUATOR INSPECTION [FULL-AUTO AIR CONDITIONER].) Is it normal?	Yes	Go to the next step.
		No	Replace the air mix actuator. (See AIR MIX ACTUATOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) Go to the next step.
3	INSPECT AIR MIX LINK OPERATION Operate the air mix link manually. Does the air mix link operate smoothly?	Yes	Reconnect the disconnected connector, then go to the next step.
		No	Replace the air mix link and the air mix crank. (See A/C UNIT DISASSEMBLY/ASSEMBLY.) Go to the next step.
4	INSPECT AIR MIX ACTUATOR CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND Disconnect the climate control unit connector. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) Apply battery positive voltage and connect the ground to the climate control unit terminal X and W, and then inspect the air mix actuator. Does the air mix actuator operate?	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 air mix actuator 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 or short to ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has an open circuit or short to ground. 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	VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN Reconnect the disconnected connector. 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 B13AA:71 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.
7	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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