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 B1C1A, B1C1A, B1C1B, B1C1B DIAGNOSTIC PROCEDURE

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