Mazda 2002 6 Workshop Manual page 1201

Terminal Signal
1W Potentiometer
signal
1X Hazard warning
SW signal
2A Panel light control
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
U–50
CONTROL SYSTEM
Connected to
Airflow mode VENT mode
actuator
BI-LEVEL mode
HEAT mode
HEAT/DEF mode
DEFROSTER mode
Hazard warning Hazard warning switch is
switch off
Hazard warning switch is
on
Panel light control Headlight switch ON and
switch panel light control switch
at max. illumination
Headlight switch ON and
panel light control switch
at min. illumination
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
Test condition Voltage (V)
Below 1.0
10.2
Below 1.0
Below 1.0
Below 1.0
Below 1.0
Below 1.0
Action
• Inspect for continuity or
4.3
short circuit (Climate control
3.3
unit—airflow mode actuator:
2.3
1W—C)
• Inspect airflow mode
1.5
actuator
• Inspect terminal voltage of
0.6
climate control unit (1B)
• Inspect for continuity or
short circuit (Climate control
12
unit—flasher unit: 1X—H)
• Inspect flasher unit
• Inspect terminal voltage of
climate control unit (1T)
• Inspect center panel
• Inspect for continuity
(Climate control unit— panel
light control switch: 2A—C)
0.2 (Panel light control switch—
ground: C—GND)
• Inspect panel light control
switch
• Inspect for short circuit
(Climate control unit— panel
light control switch: 2A—C)
• 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