DTC B13AA-71: Climate Control Unit (Full-Auto Air Conditioner): Notes

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

DTC B13AA:71 (CLIMATE CONTROL UNIT - FULL-AUTO AIR CONDITIONER) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Air mix actuator motor lock
Detection condition	Air mix actuator motor lock
Fail-safe function	Malfunction determined when ignition switched ON Air mix actuator drive signal is stopped right when the malfunction is determined. Malfunction already exists when ignition switched 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) malfunction Open circuit in wiring harness between the following terminals: Climate control unit terminal H-air mix actuator terminal E Climate control unit terminal G-air mix actuator terminal F Climate control unit terminal E-air mix actuator terminal G Climate control unit terminal W-air mix actuator terminal B Climate control unit terminal X-air mix actuator terminal C Short to ground in wiring harness between the following terminals: Climate control unit terminal H-air mix actuator terminal E Climate control unit terminal G-air mix actuator terminal F Climate control unit terminal W-air mix actuator terminal B Climate control unit terminal X-air mix actuator terminal C Short to power supply in wiring harness between the following terminals: Climate control unit terminal H-air mix actuator terminal E Climate control unit terminal G-air mix actuator terminal F Climate control unit terminal E-air mix actuator terminal G Climate control unit terminal W-air mix actuator terminal B Climate control unit terminal X-air mix actuator terminal C Climate control unit malfunction