Mazda CX-7 2007 Workshop Manual page 1187

Term Signal
Connected to
inal name
Potentiomet Airflow mode
P
er input actuator
Motor Airflow mode
Q
operation actuator
R B+ ROOM 15 A fuse
Motor
S Air mix actuator
operation
• Blower motor
Blower
• Power MOS
T motor feed
back FET
Motor
U Air mix actuator
operation
Blower fan
V speed Power MOS FET
control
W TNS signal TNS relay
Illumination
X Instrument cluster
control
CONTROL SYSTEM
Measurement
Voltage (V)
condition
VENT
BILEVEL
HEAT
HEAT/DEF
DEFROSTER
Moving towards
DEFROSTER
Moving towards VENT
Under any condition
Moving towards HOT 10.91
Moving towards COLD
Fan stopped 11.84
Fan: manual LO
Fan: manual HI
Moving towards COLD 10.96
Moving towards HOT
Fan stopped
Fan: manual LO
Fan: manual HI
Headlight switch OFF 1.0 or less
Headlight switch ON
Headlight switch ON
and panel light control
switch at max
Headlight switch ON
and panel light control
switch at min
Inspection item (s)
• Wiring harness: continuity, short circuit
4.41
(Climate control unit— airflow mode
3.54
actuator: P— C)
2.60
• Airflow mode actuator
• Climate control unit: terminal voltage (J)
1.69
0.74
• Wiring harness: continuity, short circuit
9.98
(Climate control unit— airflow mode
actuator: Q— F, O— D)
0.70
• Airflow mode actuator
• Wiring harness: continuity, short circuit
(Climate control unit— fuse: R—
B+
ROOM 15 A)
• ROOM 15 A fuse
• Wiring harness: continuity, short circuit
(Climate control unit— air mix actuator:
S— F, U— D)
0.70
• Air mix actuator
1. Wiring harness: continuity, short circuit
(Climate control unit— blower motor:
7.29
T— A) (Climate control unit— power
MOS FET: T— B, V— E) (Blower
motor— blower relay: B— A) (Blower
relay— fuse: D— BLOWER 40 A)
2. Wiring harness: continuity (Power MOS
FET— body ground: A— GND) (Blower
relay— ground: A— GND)
0.20
3. Power MOS FET
4. Blower motor
5. Blower relay
6. BLOWER 40 A fuse
7. A/C 10 A fuse
8. Power MOS FET replacement
• Wiring harness: continuity, short circuit
(Climate control unit— air mix actuator:
U— D, S— F)
0.70
• Air mix actuator
0.07 1. Climate control unit: terminal voltage (T)
3.10
7.23
• Wiring harness: short circuit (Climate
control unit— TNS relay: W— C)
• TNS relay
• Headlight switch
• Wiring harness: continuity, short circuit
(Climate control unit— TNS relay: W—
B+ C)
• TNS relay
• Headlight switch
• Wiring harness: continuity (Climate
control unit— instrument cluster: X—
0.31 2H) (Instrument cluster— body ground:
2A— GND)
• Instrument cluster
• Wiring harness: short circuit (Climate
9.56 control unit— instrument cluster: X—
2H)
07-40
07-40–15