Mazda CX-9 Grand Touring 2009 Manual page 1762

Inspect the fan in rear A/C unit.
Is the fan free of interference with the rear
A/C unit case?
10
Is the fan free of foreign material and
obstructions?
Is the fan normal?
INSPECT TO SEE WHETHER MALFUNCTION
IS IN WIRING HARNESS (OPEN CIRCUIT
BETWEEN REAR POWER MOS FET AND
CLIMATE CONTROL UNIT) OR ELSEWHERE
Turn the ignition switch to LOCK position.
Disconnect the front climate control unit
11*
connector (24-pin).
Is there continuity following terminals at harness-
side connector.
Terminal D (rear power MOS FET) and
terminal 1T (front climate control unit)
Terminal C (rear power MOS FET) and
terminal 1V (front climate control unit)
INSPECT TO SEE WHETHER MALFUNCTION
IS IN REAR POWER MOS FET OR ELSEWHERE
12
Is the air discharged from rear vent after replace
the rear power MOS FET?
VERIFY REPAIR
13
Is the air discharged from rear vent?
NO.8 AIR FROM FRONT/REAR VENTS NOT COLD ENOUGH
NO.8 AIR FROM FRONT/REAR VENTS NOT COLD ENOUGH DESCRIPTION AND POSSIBLE
CAUSE
8 Air from front/rear vents not cold enough.
DESCRIPTION
POSSIBLE
2008 Mazda CX-9 Grand Touring
2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9
Malfunction in A/C basic system
Magnetic clutch operates but A/C system malfunctions.
Drive belt malfunction
A/C unit or condenser malfunction
Receiver/drier or expansion valve malfunction (valve closes too much)
Yes Go to the next step.
Remove obstruction, repair or
No replace the fan blower unit case, then
go to Step 13.
Replace the rear power MOS FET,
Yes
then go to the next step.
Repair or replace for open circuit
between the rear power MOS FET
No
and the front climate control unit,
then go to Step 13.
Troubleshooting completed. Explain
Yes
repairs to customer.
Replace the front climate control
No
unit, then go to the next step.
Troubleshooting completed. Explain
Yes
repairs to customer.
Recheck malfunction symptoms,
No then repeat from Step 1 if the
malfunction recurs.