DTC B13AB-12; B13AB-13: 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 B13AB:12, B13AB:13 (CLIMATE CONTROL UNIT - FULL-AUTO AIR CONDITIONER) DETECTION CONDITION AND POSSIBLE CAUSE
| System malfunction location |
- B13AB:12: Air mix actuator (potentiometer) circuit short to power supply
- B13AB:13: Air mix actuator (potentiometer) circuit open
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| Detection condition |
- Malfunction in wiring harness between air mix actuator and climate control unit
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| 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
- Control based on ambient temperature.
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| Possible cause |
- Connector or terminal malfunction
- Air mix actuator 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
- 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 malfunction
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