Diagnostic Procedure

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

DUAL A/C CONTROL DOES NOT OPERATE (AUTO A/C) DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	PERFORM DASH-ELECTRICAL SUPPLY UNIT DTC INSPECTION Perform the dash-electrical supply unit DTC inspection using the M-MDS. (See DTC INSPECTION .) Are any DTCs displayed?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [DASH-ELECTRICAL SUPPLY UNIT (US)] .)
1		No	Go to the next step.
2	INSPECT AIR MIX LINK PART Inspect the air mix actuator and air mix link. Is grease on link? Are links securely and properly installed? Are links free of obstructions and hindrances? Are the above items normal?	Yes	Go to the next step.
2		No	Apply grease or securely install to the correct positions. If there is a malfunction in the air mix link, replace the air mix link. (See A/C UNIT DISASSEMBLY/ASSEMBLY [(US)] .) Then perform the repair completion verification.
3	INSPECT AIR MIX ACTUATOR Inspect the air mix actuator. (See AIR MIX ACTUATOR INSPECTION (AUTO A/C) .) Is it normal?	Yes	Go to the next step.
3		No	Replace the air mix actuator, then perform the repair completion verification. (See AIR MIX ACTUATOR REMOVAL (AUTO A/C) (US) .) (See AIR MIX ACTUATOR INSTALLATION (AUTO A/C) (US) .)
4	INSPECT AIR MIX DOOR Inspect the suspect side air mix door. Is the air mix door normal?	Yes	Replace the climate control unit, then perform the repair completion verification. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION (AUTO A/C) (US) .)
4		No	Remove the obstruction or replace A/C unit case on the suspected side, then perform the repair completion verification. (See A/C UNIT REMOVAL/INSTALLATION [(US)] .)
Repair completion verification	VERIFY THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR Can the temperatures for the driver-side and passenger-side be adjusted independently?	Yes	Troubleshooting completed. Explain repairs to customer.
Repair completion verification		No	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(US)] .) If the CAN communication is normal, perform the diagnosis from Step 1.