Diagnostic Procedure

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 B1C1C, B1C1C DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	INSPECT AIRFLOW MODE ACTUATOR Inspect the airflow mode actuator. See AIRFLOW MODE ACTUATOR INSPECTION [FULL-AUTO AIR CONDITIONER] . Is it normal?	Yes	Go to the next step
1		No	Replace the airflow mode actuator. See AIRFLOW MODE ACTUATOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER] .
2	INSPECT AIRFLOW MODE ACTUATOR (POTENTIOMETER) CIRCUIT FOR OPEN CIRCUIT Disconnect the climate control unit connector and the airflow mode actuator connector. Is there an open circuit in the wiring harness between the following terminals of the climate control unit and the airflow mode actuator? 2K-F 2B-E 2L-D	Yes	Repair the wiring harness.
2		No	Go to the next step.
3	INSPECT AIRFLOW MODE ACTUATOR (POTENTIOMETER) SHORT TO GROUND Is there a short circuit to ground in the wiring harness between climate control unit terminal 2B and airflow mode actuator terminal E?	Yes	Repair the wiring harness.
3		No	The system is normal at present. (Clear the past malfunction from the memory.