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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> On-Board Diagnostic - Auto A/C >> DTC B1C1A-12; B1C1A-13; B1C1B-12; B1C1B-13; Driver-Side And Passenger-Side Air Mix Actuator (Potentiometer) Circuit Short To Power Supply Or Circuit Open >> Notes

DTC B1C1A-12; B1C1A-13; B1C1B-12; B1C1B-13; Driver-Side And Passenger-Side Air Mix Actuator (Potentiometer) Circuit Short To Power Supply Or Circuit Open: Notes

DTC DETECTION DESCRIPTION

System malfunction location
  • B1C1A:12: Driver-side air mix actuator (potentiometer) circuit short to power supply
  • B1C1A:13: Driver-side air mix actuator (potentiometer) circuit open
  • B1C1B:12: Passenger-side air mix actuator (potentiometer) circuit short to power supply
  • B1C1B:13: Passenger-side air mix actuator (potentiometer) circuit open
Detection condition
  • Malfunction in wiring harness between air mix actuator and climate control unit
Fail-safe function Malfunction determined when ignition switched ON
  • Air mix actuator drive signal is stopped right after the malfunction is determined.
    • However, fixed at MAX COLD when set temperature is at 15.0 °C (60 °F) and fixed at MAX HOT when set temperature is at 32.0 °C (90 °F)

Malfunction already exists when ignition switched ON
  • Control based on ambient temperature.
    • However, fixed at MAX COLD when set temperature is at 15.0 °C (60 °F) and fixed at MAX HOT when set temperature is at 32.0 °C (90 °F)
Possible cause
  • Connector or terminal malfunction
  • Air mix actuator malfunction
  • Open circuit in wiring harness between the following terminals: Driver-side
    • Climate control unit terminal 1C-Air mix actuator terminal G
    • Climate control unit terminal 2K-Air mix actuator terminal F
      • Climate control unit terminal 1Q-Air mix actuator terminal E

    Passenger-side

    • Climate control unit terminal 1C-Air mix actuator terminal E
    • Climate control unit terminal 2I-Air mix actuator terminal F
      • Climate control unit terminal 1Q-Air mix actuator terminal G
  • Short to power supply in wiring harness between the following terminals:

    Driver-side

    • Climate control unit terminal 1C-Air mix actuator terminal G
    • Climate control unit terminal 2K-Air mix actuator terminal F
      • Climate control unit terminal 1Q-Air mix actuator terminal E

      Passenger-side

    • Climate control unit terminal 1C-Air mix actuator terminal E
    • Climate control unit terminal 2I-Air mix actuator terminal F
      • Climate control unit terminal 1Q-Air mix actuator terminal G
  • Climate control unit malfunction
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