Mazda CX-7 2007 Workshop Manual page 1185

CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER]
1. Remove the climate control unit. (See 07-40-25 CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-
AUTO AIR CONDITIONER].)
2. Install the audio unit. (See 09-20-4 AUDIO UNIT REMOVAL/INSTALLATION.)
3. Connect the climate control unit connector.
4. Connect the negative (-) lead of the tester to body ground.
5. Turn the ignition switch to the ON position.
6. By inserting the positive (+) lead of the tester into each climate control unit terminal, measure the voltage
according to the terminal voltage table.
• If there is any malfunction, inspect the parts under "Inspection item (s)".
— If the parts under "Inspection item (s)" are found to be normal (except for terminal T), replace the
climate control unit.
— For terminal T, first try replacing the power MOS FET. If there is still any malfunction, replace the
climate control unit.
Terminal Voltage Table (Reference)
Term Signal
Connected to
inal name
Communicat
A
ion
Communicat
B
ion
• Ambient
temperature
sensor
• Passenger
compartment
temperature
C Sensor GND sensor
• Evaporator
temperature
sensor
• Air mix actuator
• Airflow mode
actuator
D GND Body ground
Solar
Solar radiation
E radiation
sensor
sensor input
Evaporator
Evaporator
F temperature
temperature sensor
sensor input
CONTROL SYSTEM
W Q O
U S
X V T R P
Measurement
condition
— —
— —
Under any condition
Under any condition
fluorescent light shined
directly on the solar
radiation sensor
Blocking light to solar
radiation sensor
Compared with
temperature detected
by evaporator
temperature sensor
I G E
M K C A
L D
N J H F B
Voltage (V)
—
—
• Climate control unit: terminal voltage
(D)
1.0 or less
• Wiring harness: continuity (Climate
1.0 or less
control unit— GND: D— GND)
• Wiring harness: continuity (Climate
0.1—0.45 control unit—solar radiation sensor: E—
B, J—A)
• Climate control unit: terminal voltage (J)
0.1 or less • Solar radiation sensor
• Wiring harness: continuity (Climate
control unit—evaporator temperature
sensor: F—B, C—A)
• Wiring harness: short circuit (Climate
Refer to
control unit—evaporator temperature
graph 3
sensor: F—B)
• Evaporator temperature sensor
• Climate control unit: terminal voltage (D,
M)
id074000803400
acxuuw00000985
Inspection item (s)
—
—
07-40–13
07-40