Mitsubishi Evolution X. Manual - part 1088

DEFOGGER

TSB Revision

CHASSIS ELECTRICAL

54A-713

DEFOGGER

GENERAL INFORMATION

M1540500000017

The rear window defogger has been established to 
the rear window glass. To prevent battery discharge, 
A/C-ECU controls the rear window defogger to be 
automatically turned off 20 minutes after the rear 
window defogger switch is turned ON. (Only when 
engine is running)

SPECIAL TOOLS

M1547000600264

AC608069

AC608068

AC708613

<Vehicles for USA>

Rear window defogger switch

<Vehicles for CANADA>

Rear window 
defogger switch

AC

Tool

Tool number and 
name

Supersession

Application

MB991223

a. MB991219
b. MB991220
c. MB991221
d. MB991222

Harness set

a. Check harness
b. LED harness
c. LED harness 

adapter

d. Probe

General service tool 
(jumper)

Continuity check and voltage 
measurement at harness wire or 
connector

a. For checking connector pin 

contact pressure

b. For checking power supply 

circuit

c. For checking power supply 

circuit

d. For connecting a locally 

sourced tester

MB991223

a

d

c

b

DO NOT USE

BA

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TSB Revision

CHASSIS ELECTRICAL

54A-714

TROUBLESHOOTING

STANDARD FLOW OF DIAGNOSTIC TROUBLESHOOTING

M1540500700016

Refer to GROUP 00 

− Contents of troubleshooting 

P.00-7

.

SYMPTOM CHART

M1540500800013

CAUTION

During diagnosis, a DTC code associated with 
other system may be set when the ignition switch 
is turned on with connector(s) disconnected. On 
completion, confirm all systems for DTC code(s). 
If DTC code(s) are set, erase them all.

MB992006
Extra fine probe

−

Continuity check and voltage 
measurement at harness wire or 
connector

Tool

Tool number and 
name

Supersession

Application

MB992006

Symptom

Reference 
page

Rear window defogger does not operate.

P.54A-715

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TSB Revision

CHASSIS ELECTRICAL

54A-715

SYMPTOM PROCEDURES

Rear window defogger does not operate.

Rear Window Defogger Circuit

REAR
WINDOW
DEFOGGER
RELAY

JOINT
CONNECTOR (2)

RELAY BOX

REAR WINDOW
DEFOGGER

FUSIBLE
LINK

37

ETACS-ECU

REAR
WINDOW
DEFOGGER
SWITCH

INTERFACE
CIRCUIT

POWER
SOURCE

CPU

A/C
CONTROL
PANEL

PASSENGER
COMPARTMENT

DEFOGGER

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CHASSIS ELECTRICAL

54A-716

.

A/C Control Panel Circuit

A/C-ECU

A/C
CONTROL
PANEL

CPU

INTERFACE
CIRCUIT

AC506471

AC708951AJ

Connectors: C-22, C-123

C-123

C-22 (B)

AC708950BN

C-42

Connectors: C-42, C-102, C-132

C-132

C-102 (B)

AC708972BE

Connectors: C-301, C-306

ETACS-ECU

C-301

C-306

AC708955AD

Connector: D-16

AC708970AQ

Connectors: F-03, F-29

F-03 (B)

F-29 (B)