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.7 AMOUNT OF AIR FROM REAR VENTS DOES NOT CHANGE DIAGNOSTIC PROCEDURE
z
Rear climate control unit malfunction
STEP
INSPECTION
ACTION
1
INSPECT TO SEE WHETHER MALFUNCTION
IS IN REAR A/C UNIT OR ELSEWHERE
z
Turn the ignition switch to the ON position.
z
Turn the rear fan switch the ON position.
z
Does the blower motor rotate smoothly?
Yes Go to the next step.
No
Go to Step 3.
2
INSPECT REAR A/C UNIT INTAKE VENT
z
Is the rear A/C unit intake vent clogged?
Yes
Remove obstruction, then go to Step
13.
No
Inspect if there are any obstructions
in the rear A/C unit passage, then go
to Step 13.
3*
INSPECT TO SEE WHETHER MALFUNCTION
IS IN REAR BLOWER RELAY SYSTEM OR
REAR POWER MOS FET
z
Turn the ignition switch to ON position.
z
Turn the rear fan switch to OFF position.
z
Measure the voltage at the following rear blower
motor terminal.
{
Terminal B (rear blower motor operation
signal)
z
Is the voltage normal (B+)?
Yes Go to the Step 7.
No
Go to the next step.
4*
INSPECT TO SEE WHETHER MALFUNCTION
IS IN WIRING HARNESS (OPEN OR SHORT
CIRCUIT BETWEEN FUSE BLOCK AND REAR
BLOWER RELAY) OR ELSEWHERE
z
Measure the voltage at the following rear relay
terminals.
{
Terminal A (IG2 signal)
{
Terminal D (B+ signal)
z
Is the voltage
approx. 12 V?
Yes Go to the next step.
No
If the terminal A voltage is not
normal, repair or replace wiring
harness between A/C 7.5 A fuse and
rear blower relay.
If the terminal D voltage is not
normal, repair or replace wiring
harness between R.HEATER 40 A
fuse and rear blower relay. Then go
to Step 13.
2008 Mazda CX-9 Grand Touring
2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:14:51 AM
Page 19
© 2005 Mitchell Repair Information Company, LLC.
