z
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
connected correctly and undamaged.
DIAGNOSTIC PROCEDURE
NO.5 WINDSHIELD FOGGED DIAGNOSTIC PROCEDURE
STEP
INSPECTION
ACTION
1
COOL AIR BLOW OUT INSPECTION
z
When both the A/C and fan switch in the front
climate control unit are on, does cool air blow out
from the front vent?
Yes Go to the next step.
No
Go to Step 1 of troubleshooting
index No.8.
2
INSPECT FRONT CLIMATE CONTROL UNIT
POWER SUPPLY FUSE FOR B+ SIGNAL
z
Is the front climate control unit power supply fuse
for B+ signal normal?
Yes Go to the next step.
No
Inspect for a short to ground on
blown fuse circuit.
Repair or replace if necessary.
Install appropriate amperage fuse.
3
INSPECT AIR INTAKE ACTUATOR
z
Inspect the air intake actuator for followings.
{
Is there grease on the link?
{
Is the link securely and properly positioned?
{
Is the link free of obstructions?
z
Are the above items normal?
Yes Go to the next step.
No
Apply grease or install the link
properly and securely, remove
obstruction, then go to Step 14.
*4
INSPECT WIRING HARNESS BETWEEN FUSE
BLOCK AND FRONT CLIMATE CONTROL UNIT
FOR CONTINUITY
z
Disconnect the front climate control unit connector
(24-pin).
z
Turn the ignition switch to the ON position.
z
Measure the voltage at front climate control unit
terminal 1B (B+ signal).
z
Is the voltage
approx. 12 V?
Yes Go to the next step.
No
Repair the wiring harness between
the fuse block and front climate
control unit, then go to Step 14.
*5
INSPECT WIRING HARNESS BETWEEN FRONT
CLIMATE CONTROL UNIT AND GROUND FOR
VOLTAGE
z
Measure the voltage at front climate control unit
terminal 1X (Ground).
z
Is the voltage
approx. 0 V?
Yes Go to the next step.
No
Repair the wiring harness between
the front climate control unit and
ground, then go to Step 14.
2008 Mazda CX-9 Grand Touring
2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:14:50 AM
Page 14
© 2005 Mitchell Repair Information Company, LLC.
