Mazda CX-9 Grand Touring 2009 Manual page 1756

VERIFY WHETHER MALFUNCTION IS IN A/C
UNIT AIR INTAKE DOOR OR ELSEWHERE
Turn the ignition switch to the LOCK position.
Connect the climate control unit connector (24-
pin).
6
Remove the air intake actuator.
Turn the ignition switch to the ON position.
Set the fan switch to 4th position.
Does the air intake mode (RECIRCULATE,
FRESH) change smoothly when the air intake link
is operated by hand?
INSPECT AIR INTAKE ACTUATOR
Inspect the air intake actuator. (See AIR INTAKE
7
ACTUATOR INSPECTION .)
Is it normal?
INSPECT AIR INTAKE SELECTOR SWITCH AND
DEFROSTER SWITCH IN FRONT CLIMATE
CONTROL UNIT
8
Measure the voltage at front climate control unit
connector (24-pin) terminals 1O and 1M.
Is it normal?
INSPECT WIRING HARNESS BETWEEN FRONT
CLIMATE CONTROL UNIT AND AIR INTAKE
ACTUATOR FOR CONTINUITY
Turn the ignition switch to the LOCK position.
Is there continuity between the following front
*9
climate control unit terminals and air intake
actuator terminals?
Terminal C - Terminal 10 (RECIRCULATE
signal)
Terminal A - Terminal 1M (FRESH signal)
INSPECT WIRING HARNESS BETWEEN FRONT
CLIMATE CONTROL UNIT AND AIR INTAKE
ACTUATOR FOR SHORT TO GROUND
*10
Is there continuity between the following front
climate control unit terminals and ground?
Terminal 10 (RECIRCULATE signal)
Terminal 1M (FRESH signal)
2008 Mazda CX-9 Grand Touring
2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9
Yes Go to the next step.
No Go to Step 12.
Yes Go to the next step.
Replace the air intake actuator, go
No
to Step 14.
Yes Go to the next step.
Replace the front climate control
No
unit, then go to Step 14.
Yes Go to the next step.
Repair the wiring harness between
No the front climate control unit and air
intake actuator, then go to Step 14.
Repair the wiring harness between
Yes the front climate control unit and air
intake actuator, then go to Step 14.
No Go to the next step.