Subaru Impreza 2002 Service Manual page 3224

DIAGNOSTICS CHART FOR DIAGNOSIS SYSTEM
Step
5 CHECK MODE DOOR POSITION SIGNAL.
1)Turn the fan speed control dial to 2nd posi-
tion.
2)If the system has trouble for mode door posi-
tion signal, rear window defogger switch LED
is turned off.
3)If the system has no trouble, rear window
defogger switch LED is illuminated.
6 CHECK BLOWER FAN OPERATION.
1)Turn the fan speed control dial to 3rd posi-
tion.
2)Turn the temperature control dial, check that
blower fan speed changes depending on set
temperature.
7 CHECK OPERATION OF EACH ACTUATOR,
BLOWER FAN AND COMPRESSOR
CLUTCH.
1)Turn the fan speed control dial to 4th posi-
tion.
2)Select the operating mode by turning air flow
control dial.
3)Check the operation of each mode according
to operating mode table. <Ref. to AC-20,
OPERATING MODE TABLE, SELF-DIAGNO-
SIS MODE, Diagnostics Chart for Diagnosis
System.>
•Air inlet:
•Air outlet:
•Air mix door:
•Blower fan:
•A/C compressor:
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Check
Does the rear window defog-
ger switch LED illuminate?
Does the blower fan speed
change?
Does the operation of each
mode match to the operating
mode table?
AC-19
Yes
Go to step 6. Check the mode
door actuator cir-
cuit. <Ref. to AC-
34, MODE DOOR
ACTUATOR,
Diagnostic Proce-
dure for Actua-
tors.>
Go to step 7. Check the blower
motor circuit. <Ref.
to AC-24,
BLOWER MOTOR
IS NOT
ROTATED, Diag-
nostics for A/C
System Failure.>
Push the A/C Repair the mal-
switch or turn igni- function part
tion switch OFF, according to each
and finish the self- diagnostics chart.
diagnosis.
No