Subaru Forester 2.5X 2003 Technicians Reference Booklet page 20

2003 New Model Update
Self Diagnostic Procedure
Push and hold the "DEF" and the "A/C" switch while starting the engine.
All of the LEDs will turn on and off in following sequence of 5 steps.
Step Fan
1 1
2 2
3 3
4 4
5 4
This process will cycle twice. At the end of the second cycle all LEDs should be off.
Except the A/C LED. Except the A/C LED. Except the A/C LED. Except the A/C LED. Except the A/C LED. LEDs remaining on indicate a problem and the condition of that problem.
The chart below describes how to interpret the LED and corresponding problem,
Step Sensor
1 In-vehicle
2 Ambient
3 Evaporator
4 Sun load
5 Air mix door PBR
6 Combination Meter
Communication
If the "DEF" led "DEF" led "DEF" led "DEF" led is off "DEF" led off during any of the 6 steps for sensor checks an open circuit off off off
"DEF" led "DEF" led on on
If the "DEF" led "DEF" led is on "DEF" led on on during any of the 6 steps for sensor checks a shorted circuit
If the Rear window defogger LED Rear window defogger LED is off Rear window defogger LED Rear window defogger LED
Rear window defogger LED
a current failure current failure current failure current failure. current failure
If the Rear window defogger LED Rear window defogger LED Rear window defogger LED is on Rear window defogger LED
Rear window defogger LED
a previous failure previous failure previous failure previous failure. previous failure
Mode Def
Vent On
Bilevel
Heat
Def/Heat
Def/Heat
off during any of the 6 steps for sensor checks the problem is off off
off
on during any of the 6 steps for sensor checks the problem is on on
on
(912)
Rear Def
On
LED
Vent
Bi-Level
Heat
Def/Heat
Fan Speed 1
Fan Speed 2
open circuit can be assumed. open circuit open circuit open circuit
shorted circuit shorted circuit
shorted circuit can be assumed. shorted circuit
20
Forester
A/C Recirc
On
On
Auto
On
June 2002