Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 700
GW-33
Rear Window Defogger System
GLASS/WINDOWS/MIRRORS
16.Rear Window Defogger Sys-
tem
A: WIRING DIAGRAM
Refer to “Rear Defogger System” in the wiring dia-
gram. <Ref. to WI-135, WIRING DIAGRAM, Rear
B: INSPECTION
1. SYSTEM INSPECTION
NOTE:
Rear window defogger system can be customized
on the Subaru Select Monitor, when the body inte-
grated unit customize setting {A/C ECM setting} is
“support”.
2. CHECK WITH SUBARU SELECT MONI-
TOR
CAUTION:
Check whether the “Rr defogger op. mode” set-
ting is in initial setting or customize setting be-
fore performing 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-
(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 {Rr defogger output} on {Current
Data Display & Save}.
(5) Check the displayed data (ON/OFF) by op-
erating the rear window defogger switch.
2) Check the operation with rear window defogger
switch ON.
• When customize setting is set as “Continuous”, it
is normal if the 15-minute operation and 2-minute
stop repeats.
• When customize setting is “Normal”, it is normal
if the operation lasts for 15 minutes and then turns
OFF.
3) When the operation in 2) above fails, replace the
body integrated unit.
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.
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.
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.
Symptom
Repair order
Rear window defog-
ger does not operate.
1. Check the fuse.
2. Check the rear defogger relay.
3. Check the rear defogger switch.
4. Check the heat wire.
5. Check the wiring harness.
6. Check body integrated unit.
System name
Initial setting
Customize setting
Rr defogger op.
mode
OFF after 15 min.
Repeat 15 min. oper-
ation and 2 min.
stop.
(A) Liquid crystal thermograph sheet
(B) Separate line
Liquid crystal thermograph sheet
Criteria
Change occurred (red → blue)
Normal
No change (black)
Open
(A)
(B)
GW-00756