Mazda CX-9 Grand Touring 2009 Manual page 1770

Terminal B (magnetic clutch operation
signal)
Is voltage approx. 12 V?
INSPECT FUSE
12
Are A/C relay power supply fuses okay?
INSPECT WIRING HARNESS BETWEEN
FUSE BLOCK AND A/C RELAY FOR LACK
OF CONTINUITY
Test voltages at following terminals of A/C
13
relay.
Terminal E (A/C relay control signal)
Terminal C (A/C control signal)
Are voltages approx. 12 V?
INSPECT TO SEE WHETHER
MALFUNCTION IS IN A/C RELAY OR
WIRING HARNESS (BETWEEN A/C RELAY
AND MAGNETIC CLUTCH) AND
EVAPORATOR TEMPERATURE SENSOR
14
Test voltage at the following terminal of A/C
relay.
Terminal D (magnetic clutch operation
signal)
Is voltage approx. 12 V?
INSPECT EVAPORATOR TEMPERATURE
SENSOR
15
Inspect evaporator temperature sensor.
Is it okay?
VERIFY REPAIR
16 Does cool air blow out from front/rear vents?
(Are the results of refrigerant system
performance test okay?)
NO.10 NOISE WHILE OPERATING A/C SYSTEM.
NO.10 NOISE WHILE OPERATING A/C SYSTEM DESCRIPTION AND POSSIBLE CAUSE
10 Noise while operating A/C system.
2008 Mazda CX-9 Grand Touring
2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9
Problem with A/C basic system installation
No Go to the next step.
Yes Go to the next step.
Replace fuse, then go to Step 16. If fuse
No burns out immediately, go to the next
step.
Yes Go to the next step.
Repair wiring harness between fuse block
No
and A/C relay, then go to Step 16.
Inspect wiring harness between A/C relay
and magnetic clutch.
If above wiring harness is OK, go
Yes
to the next step.
If above wiring harness
malfunctions, repair wiring harness,
then go to Step 16.
No Replace A/C relay, then go to Step 16.
Yes Go to the next step.
Replace evaporator temperature sensor,
No
then go to the next step.
Troubleshooting completed. Explain
Yes
repairs to customer.
Recheck malfunction symptoms, then
No
repeat from Step 1 if malfunction recurs.