Mazda Mazda6 Workshop Manual Supplement page 880

Terminal Signal
1B +5 V
1C Blower motor
control signal
1D —
1E Rear window
defroster SW
signal
1F On-board
diagnostic signal
1G —
1H —
1I GND
1J Water heater
select
CONTROL SYSTEM
Connected to Test condition
• Air mix actuator
Ignition switch at ON
• Airflow mode
position
actuator
• Solar radiation
sensor
Ignition switch at LOCK
position
Power MOS FET Fan switch is OFF
Fan switch is at manual
LO
Fan switch is at manual
HI
—
Rear window Rear window defroster
defroster relay switch is off
Rear window defroster
switch is on
A/C check Terminal A of A/C check
connector connector is shorted.
Other
—
—
• Cabin
Under any condition
temperature
sensor
• Evaporator
temperature
sensor
• Ambient
temperature
sensor
• Water
temperature
sensor
• Air mix actuator
• Airflow mode
actuator
Ground Under any condition
Voltage (V)
5.0
Below 1.0
Below 1.0
4.1
7.9
— —
12
Below 1.0
Below 1.0
5.4
— —
— —
Below 1.0
Below 1.0
Action
• Inspect for short circuit
(Climate control unit— air
mix actuator, airflow mode
actuator, solar radiation
sensor: 1B—B, B, A)
• Inspect air mix actuator
• Inspect airflow mode
actuator
• Inspect solar radiation
sensor
• Inspect terminal voltage of
climate control unit
connector (2H, 2L)
• Replace climate control unit
• Inspect terminal voltage of
climate control unit (1A)
—
• Inspect for continuity or
short circuit (Climate control
unit—rear window defroster
relay: 1E—E)
• Inspect rear window
defroster relay
• Inspect terminal voltage of
climate control unit (2H, 2L)
• Inspect center panel
• Inspect for continuity
(Climate control unit—A/C
check connector: 1F—A)
• Inspect short circuit (Climate
control unit—A/C check
connector: 1F—A)
• Inspect terminal voltage of
climate control unit (2H, 2L)
—
—
• Inspect terminal voltage of
climate control unit (2L)
• Inspect for continuity
(Climate control unit—
ground: 1J—GND)
• Inspect center panel
U–17
U