Subaru Impreza 2002 Service Manual page 3223

DIAGNOSTICS CHART FOR DIAGNOSIS SYSTEM
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
5. Diagnostics Chart for Diagnosis System
A: SELF-DIAGNOSIS MODE
(1)
(1) Air flow control dial
(2) Rear window defogger switch
Step
1 SELECT CONTROL PANEL TO SELF-DIAG-
NOSIS MODE.
1)Turn the fan speed control dial to OFF posi-
tion.
2)Start the engine and press rear window
defogger switch for at least 5 seconds. The
rear window defogger switch must be pressed
within 10 seconds after starting engine.
2 CHECK LED ILLUMINATION.
Make sure that all switch LED illuminates
(RHD model) or blink (LHD model) on control
panel.
3 CHECK SENSORS MALFUNCTION.
1)Turn the fan speed control dial to AUTO
position.
2)If the system has trouble for each sensor,
rear window defogger switch LED is turned off.
3)If the system has no trouble, rear window
defogger switch LED is illuminated.
4 CONFIRM MALFUNCTIONING SENSOR.
1)Turn the fan speed control dial to 1st posi-
tion.
2)Turn the air flow control dial to each mode
position, check each switch LED illumination
according to sensor check table. <Ref. to AC-
20, SENSOR CHECK TABLE, SELF-DIAGNO-
SIS MODE, Diagnostics Chart for Diagnosis
System.>
(2) (3)
(6)
(3) A/C switch
(4) FRESH/RECIRC switch
Does the self-diagnosis mode
operate?
Do all LED illuminate or blink? Go to step 3.
Does the rear window defog-
ger switch LED illuminate?
Do FRESH/RECIRC and A/C
switch LED illuminate when
turning the dial to each mode
position?
AC-18
(4)
(5) Temperature control dial
(6) Fan speed control dial
Check
Go to step 2.
Go to step 5.
Go to step 5.
(5)
HV0033
Yes No
<Ref. to AC-22, A/
C AND/OR SELF-
DIAGNOSIS SYS-
TEMS DO NOT
OPERATE, Diag-
nostics for A/C
System Failure.>
Check the switch
LED.
Go to step 4.
Repair the mal-
functioning sensor.
<Ref. to AC-38,
Diagnostic Proce-
dure for Sensors.>