Diagnostics Chart For Self-Diagnosis - Subaru Impreza 2004 Service Manual

5. Diagnostics Chart for Self-diagnosis

A: OPERATION
(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 the 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 posi-
tion.
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(diag)-11, SENSOR CHECK TABLE,
OPERATION, Diagnostics Chart for Self-diag-
nosis.>
Diagnostics Chart for Self-diagnosis
(2)
(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 defogger
switch LED illuminate?
Do FRESH/RECIRC and A/C
switch LED illuminate when
turning the dial to each mode
position?
AC(diag)-9
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
(3) (4)
(5)
(6)
Check
(5)
Temperature control dial
Fan speed control dial
Yes
Go to step 2. <Ref. to AC(diag)-
12, A/C AND/OR
SELF-DIAGNO-
SIS SYSTEMS
DO NOT OPER-
ATE, Diagnostics
for A/C System
Malfunction.>
Check the switch
LED.
Go to step 5. Go to step 4.
Go to step 5. Repair the mal-
functioning sen-
sor. <Ref. to
AC(diag)-29, Diag-
nostic Procedure
for Sensors.>
AC-00654
No