Amount Of Air Blown From Vents Does Not Change (Auto A/C) (Us): Notes

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.

AMOUNT OF AIR BLOWN FROM VENTS DOES NOT CHANGE (AUTO A/C) (US) DESCRIPTION AND POSSIBLE CAUSE

Troubleshooting item	Amount of air blown from vents does not change
Description	Blower motor does not operate even if airflow volume control switch is operated (no airflow from vent) Blower motor operation does not change even if airflow volume control switch is operated (airflow volume from vent does not change)
Possible cause	Dash-electrical supply unit detects DTC Detects DTC and activates fail-safe Blower unit malfunction Blockage Interference between blower motor fan and case Open circuit in blower motor power supply circuit Short to ground in blower motor power supply circuit Blower motor malfunction Open circuit in blower motor signal circuit Short to ground in blower motor signal circuit Short to power supply in blower motor signal circuit Climate control unit malfunction Blower fan controller (built-in dash-electrical supply unit) malfunction
Courtesy of MAZDA MOTORS CORP.

When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, inspect make sure connectors, terminals and wiring harnesses are connected correctly and undamaged.