DTC B1C1A:11, B1C1A:13, B1C1B:11, B1C1B:13: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DTC B1C1A, B1C1A, B1C1B, B1C1B DETECTION CONDITION AND POSSIBLE CAUSE

DTC B1C1A:11	Driver-side air mix actuator (potentiometer) circuit short to ground
DTC B1C1A:13	Driver-side air mix actuator (potentiometer) circuit open
DTC B1C1B:11	Passenger-side air mix actuator (potentiometer) circuit short to ground
DTC B1C1B:13	Passenger-side air mix actuator (potentiometer) circuit open
POSSIBLE CAUSE	Air mix actuator malfunction Open circuit in wiring harness between climate control unit connector terminal 2K and air mix actuator connector terminal D (Driver-side) Open circuit in wiring harness between climate control unit connector terminal 2C and air mix actuator connector terminal E (Driver-side) Open circuit in wiring harness between climate control unit connector terminal 2L and air mix actuator connector terminal F (Driver-side) Open circuit in wiring harness between climate control unit connector terminal 2K and air mix actuator connector terminal F (Passenger-side) Open circuit in wiring harness between climate control unit connector terminal 2A and air mix actuator connector terminal E (Passenger-side) Open circuit in wiring harness between climate control unit connector terminal 2L and air mix actuator connector terminal D (Passenger-side) Short to ground in wiring harness between climate control unit connector terminal 2C and air mix actuator connector terminal E (Driver-side) Short to ground in wiring harness between climate control unit connector terminal 2A and air mix actuator connector terminal E (Passenger-side)
Courtesy of MAZDA MOTORS CORP.