Mazda Mazda6 Workshop Manual Supplement page 883

Terminal Signal
2B TNS signal
2C Motor drive signal Air mix actuator
2D Motor drive signal Air mix actuator
2E Motor drive signal Airflow mode
2F Backup power
supply
2G Motor drive signal Airflow mode
2H IG2
2I Motor drive signal Air intake actuator
2J —
2K Motor drive signal Air intake actuator
2L GND
U–20
CONTROL SYSTEM
Connected to
TNS relay Headlight switch OFF
Headlight switch ON
Moving to COLD
Moving to HOT
Moving to HOT
Moving to COLD
Moving to DEFROSTER
actuator
Moving to VENT
ROOM 15 A fuse Under any condition
Moving to VENT
actuator
Moving to DEFROSTER
A/C 15 A fuse Ignition switch at ON
position
Ignition switch at LOCK
position
Moving to
RECIRCULATE
Moving to FRESH
—
Moving to FRESH
Moving to
RECIRCULATE
Ground Under any condition
Test condition Voltage (V)
Below 1.0
Below 1.0
Below 1.0
Below 1.0
Below 1.0
Below 1.0
Below 1.0
—
Below 1.0
Below 1.0
Action
• Inspect for short circuit
(Climate control unit—TNS
relay: 2B—D)
• Inspect TNS relay
• Inspect headlight switch
• Inspect for continuity or
short circuit (Climate control
12 unit—TNS relay: 2B—D)
• Inspect TNS relay
• Inspect headlight switch
• Inspect for continuity or
12
short circuit (Climate control
unit—air mix actuator: 2D—
D, 2C—F)
• Inspect air mix actuator
• Inspect for continuity or
12
short circuit (Climate control
unit—air mix actuator: 2C—
F, 2D—D)
• Inspect air mix actuator
• Inspect for continuity or
12
short circuit (Climate control
unit—airflow mode actuator:
2E—F, 2G—D)
• Inspect airflow mode
actuator
• Inspect for continuity or
short circuit (Climate control
B+ unit—fuse: 2F— ROOM 15
A fuse)
• Inspect ROOM 15 A fuse
• Inspect for continuity or
12
short circuit (Climate control
unit—airflow mode actuator:
2G—D, 2E—F)
• Inspect airflow mode
actuator
• Inspect for continuity or
short circuit (Climate control
B+ unit—fuse: 2H—A/C 15 A
fuse)
• Inspect A/C 15 A fuse
• Inspect for short circuit
(Climate control unit—fuse:
2H—A/C 15 A fuse)
• Inspect for continuity or
12
short circuit (Climate control
unit—air intake actuator:
2I—F, 2K—D)
• Inspect air intake actuator
— —
• Inspect for continuity or
12
short circuit (Climate control
unit—air intake actuator:
2K—D, 2I—F)
• Inspect air intake actuator
• Inspect for continuity
(Climate control unit—
ground: 2L—GND)