Rear Window Defogger System - Subaru 2009 IMPREZA Service Manual

16.Rear Window Defogger
System
A: WIRING DIAGRAM
Refer to "Rear Defogger System" in WI section.
<Ref. to WI-135, WIRING DIAGRAM, Rear Defog-
ger System.>
B: INSPECTION
1. SYSTEM INSPECTION
Symptom
Rear window defogger does
not operate.
NOTE:
Rear window defogger system can be customized
on the Subaru Select Monitor.
System name Initial setting
Rear window
OFF after 15 min.
defogger timer
2. CHECK WITH SUBARU SELECT
MONITOR
CAUTION:
Check that the rear window defogger timer is in
initial setting or customize setting before per-
forming inspection.
1) Check the input signal when the rear window de-
fogger switch is operated using Subaru Select
Monitor.
(1) Prepare the Subaru Select Monitor. <Ref. to
GW-7, PREPARATION TOOL, General De-
scription.>
(2) Turn the ignition switch to ON (engine OFF)
and run the "PC application for Subaru Select
Monitor".
(3) On «System Selection Menu» display, se-
lect {Integ. unit mode}.
(4) Select the {Current Data Display & Save}.
(5) Display the data of rear window defogger
switch.
2) After rear window defogger switch is set to ON,
check whether it turns to OFF in 15 minutes or re-
peats 15 minutes operation and 2 minutes stop.
3) When it becomes OFF on above 2), it is normal.
When it repeats 15 minutes operation and 2 min-
utes stop, replace body integrated unit.

Rear Window Defogger System

Repair order
1. Fuse (M/B No. 10)
2. Rear defogger relay
3. Defogger switch
4. Heat wire
5. Wiring harness
6. Body integrated unit
Customize setting
Repeat 15 min.
operation and 2
min. stop.
GW-29
GLASS/WINDOWS/MIRRORS
3. HEAT WIRE INSPECTION
CAUTION:
When wiping off the stain on glass with cloth,
use a dry and soft cloth and move it in the direc-
tion of the heat wire extension to avoid damage
to the heat wire.
1) Prepare the following checking items.
• Liquid crystal thermograph sheet (Approximate
Size: 300 × 300 mm (11.8 × 11.8 in) and thermal
temperature: 35 — 40°C (95 — 104°F))
• Aluminum foil
2) Turn the ignition switch to ON.
3) Turn the defogger switch to ON.
4) Push the liquid crystal thermograph sheet from
the outside of the rear glass.
(A) Liquid crystal thermograph sheet
(B) Separate line
NOTE:
Use the liquid crystal thermograph sheet every
range it is separated with the separate line.
5) Determine the faulty heat wire by checking the
color of the liquid crystal thermograph sheet.
Liquid crystal thermograph
sheet
Change occurred
(red blue)
No change (black)
NOTE:
• Check from the inside of the glass if the liquid
crystal thermograph sheet does not change.
• The time for the color change may differ depends
on the surface temperature of the glass.
(A)
(B)
GW-00756
Criteria
Normal
Open