Mazda CX-9 Grand Touring 2009 Manual page 1749

FRONT POWER MOS FET AND FRONT CLIMATE
CONTROL UNIT) OR ELSEWHERE
Turn the ignition switch to the LOCK position.
Disconnect front climate control unit connector.
Inspect for continuity at the following terminals
13*
between the front power MOS FET and front climate
control unit.
Terminal F-1R (blower motor control signal)
Terminal B-1P (blower motor feedback signal)
Is there continuity?
INSPECT TO SEE WHETHER MALFUNCTION IS IN
CLIMATE CONTROL UNIT OR WIRING HARNESS
(SHORT TO GROUND IN WIRING HARNESS
BETWEEN FRONT POWER MOS FET AND FRONT
CLIMATE CONTROL UNIT)
14*
Inspect for continuity at the following terminal between
the power MOS FET and ground.
Terminal D (blower motor control signal)- ground
Is there continuity?
VERIFY REPAIR
15
Is air discharged from vent?
NO.3 AIR INTAKE MODE FROM FRONT VENT DOES NOT CHANGE
NO.3 AIR INTAKE MODE FROM FRONT VENT DOES NOT CHANGE DESCRIPTION AND
POSSIBLE CAUSE
3 Air intake mode from front vent does not change.
DESCRIPTION
POSSIBLE
CAUSE
When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors
while doing the inspection to discover whether poor contact points are the cause of any intermittent
malfunctions. If there is a problem, inspect to make sure connectors, terminals and wiring harness are
2008 Mazda CX-9 Grand Touring
2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9
Malfunction in A/C unit and/or front climate control unit air intake mode
switching system
Air intake mode does not change when switching REC/FRESH mode.
Air intake actuator malfunction
Air intake door malfunction
Repair the wiring harness
between the front power MOS
No
FET and climate control unit,
then go to Step 15.
Repair the wiring harness
between the front power MOS
Yes
FET and ground, then go to the
next step.
Replace the front climate
No control unit, then go to the next
step.
Troubleshooting completed.
Yes
Explain repairs to customer.
Recheck malfunction
symptoms, then repeat from
No
Step 1 if the malfunction
recurs.