Mazda 2002 6 - Page 1201

U–50
CONTROL SYSTEM
1W Potentiometer
signal
Airflow mode
actuator
VENT mode 4.3 • Inspect for continuity or
short circuit (Climate control
unit—airflow mode actuator:
1W—C)
• Inspect airflow mode
actuator
• Inspect terminal voltage of
climate control unit (1B)
BI-LEVEL mode 3.3
HEAT mode 2.3
HEAT/DEF mode 1.5
DEFROSTER mode
0.6
1X Hazard warning
SW signal
Hazard warning
switch
Hazard warning switch is
off
12
• Inspect for continuity or
short circuit (Climate control
unit—flasher unit: 1X—H)
• Inspect flasher unit
Hazard warning switch is
on Below 1.0
• Inspect terminal voltage of
climate control unit (1T)
• Inspect center panel
2A Panel light control
signal
Panel light control
switch
Headlight switch ON and
panel light control switch
at max. illumination
0.2
• Inspect for continuity
(Climate control unit— panel
light control switch: 2A—C)
(Panel light control switch—
ground: C—GND)
• Inspect panel light control
switch
Headlight switch ON and
panel light control switch
at min. illumination
10.2
• Inspect for short circuit
(Climate control unit— panel
light control switch: 2A—C)
2B TNS signal TNS relay Headlight switch OFF
Below 1.0
• Inspect for short circuit
(Climate control unit—TNS
relay: 2B—D)
• Inspect TNS relay
• Inspect headlight switch
Headlight switch ON
12
• Inspect for continuity or
short circuit (Climate control
unit—TNS relay: 2B—D)
• Inspect TNS relay
• Inspect headlight switch
2C Motor drive signal Air mix actuator Moving to COLD 12 • Inspect for continuity or
short circuit (Climate control
unit—air mix actuator: 2D—
D, 2C—F)
• Inspect air mix actuator
Moving to HOT
Below 1.0
2D Motor drive signal Air mix actuator Moving to HOT 12 • Inspect for continuity or
short circuit (Climate control
unit—air mix actuator: 2C—
F, 2D—D)
• Inspect air mix actuator
Moving to COLD
Below 1.0
2E Motor drive signal Airflow mode
actuator
Moving to DEFROSTER 12 • Inspect for continuity or
short circuit (Climate control
unit—airflow mode actuator:
2E—F, 2G—D)
• Inspect airflow mode
actuator
Moving to VENT
Below 1.0
2F Backup power
supply
ROOM 15 A fuse Under any condition
B+
• Inspect for continuity or
short circuit (Climate control
unit—fuse: 2F— ROOM 15
A fuse)
• Inspect ROOM 15 A fuse
2G Motor drive signal Airflow mode
actuator
Moving to VENT 12 • Inspect for continuity or
short circuit (Climate control
unit—airflow mode actuator:
2G—D, 2E—F)
• Inspect airflow mode
actuator
Moving to DEFROSTER
Below 1.0
Terminal Signal Connected to Test condition Voltage (V) Action