Mitsubishi Galant (2004+). Manual - part 1496

DEFOGGER

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CHASSIS ELECTRICAL

54A-227

REAR WINDOW DEFOGGER SWITCH

REMOVAL AND INSTALLATION

M1543006200325

Refer to GROUP 55A, Heater Control Assembly and 
A/C Switch 

P.55A-270

.

INSPECTION

M1543019502537

DEFOGGER RELAY CONTINUITY CHECK

BATTERY VOLTAGE CONNECT 

TESTER 
BETWEEN: 

SPECIFIED 
CONDITION

Not applied

4-5

Open Circuit

• Connect terminal 1 

to the positive 
battery terminal

• Connect terminal 3 

to the negative 
battery terminal

4-5

Less than 2 ohms

AC307916

4

5

1

3

AB

DEFOGGER RELAY

MULTI-CENTER DISPLAY

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CHASSIS ELECTRICAL

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MULTI-CENTER DISPLAY

GENERAL DESCRIPTION

M1543000100364

Two types of multi-center display are available; low 
grade type and middle grade type. The middle grade 
type display can show a message based on informa-
tion, which is obtained via M bus and CAN bus com-
munication. In addition, the middle grade type 
display offers a service mode function (self-diagno-
sis), overwrite (customize) function of the ETACS 
and multi-center display setting.

.

Character display function of low grade 
multi-center display

• Clock display (incorporating clock)

• Audio system operation display (communicating 

with radio and CD player via M bus)

.

Graphical display function of middle grade 
multi-center display

• Clock display (incorporating clock)

• Calendar display

• Audio system operation display (communicating 

with radio, CD player and CD changer via M bus)

• Speaker test display (communicating with radio, 

CD player and CD changer via M bus)

• Compass display (incorporating compass sensor)

• Ambient air temperature display (communicating 

with the A/C-ECU via CAN bus)

• Freeze warning display (communicating with the 

A/C-ECU via CAN bus)

• A/C operation display (communicating with the 

A/C ECU via CAN bus)

Precautions during service

.

Diagnosis tips concerning the entire system

• Check that relevant wiring harness connectors 

are engaged correctly. If a failure is found, repair 
the connectors and check the trouble symptom 
again.

• If the wiring harness connectors are engaged 

correctly, check the wiring harness. If the wiring 
harness is in good condition, replace relevant 
components.
NOTE: If a system communication (CAN commu-
nication) related failure is suspected, diagnose 
the CAN communication system.

.

Diagnosis tips when only specific function(s) is 
defective

• Check that the wiring harness connectors related 

to the specific function are engaged correctly. If a 
failure is found, repair the connectors and check 
the trouble symptom again.

• If the wiring harness connectors are engaged 

correctly, check the wiring harness. If the wiring 
harness is in good condition, replace relevant 
components, which controls that function.

MULTI-CENTER DISPLAY

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CHASSIS ELECTRICAL

54A-229

MULTI-CENTER DISPLAY SYSTEM <MIDDLE GRADE TYPE>

AC209281

FUNCTION 
BUTTON 
SWITCH 1

FUNCTION 
BUTTON 
SWITCH  2

FUNCTION 
BUTTON 
SWITCH  3

DISPLAY 
BUTTON 
SWITCH 

AB

MULTI-CENTER DISPLAY (middle grade type)

AC208668

A/C DISPLAY

AMBIENT  AIR TEPERATURE 
DISPLAY CUSTOMIZE FUNCTION

ETACS-ECU

A/C-ECU

POWER TRAIN 
CONTROL
MODULE

AMBIENT AIR 
TEMPERATURE 
SENSOR

COMBINATION 
METER

RADIO, CD PLAYER 
AND CD CHNGER

CAN-BUS

M-BUS

NULTI-CENTER DISPLAY <MIDDLE GRADE TYPE>

AB

CLOCK

COMPASS
SENSOR

SYSTEM BLOCK

COMPASS
DISPLAY

AUDIO 
DISPLAY

MULTI-CENTER DISPLAY

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CHASSIS ELECTRICAL

54A-230

Communication error processing <middle grade type>

The multi-center display unit (middle grade type) 
communicates with specific units via CAN and M bus 
lines. If an abnormality occurs (such as communica-
tion cancellation, interruption or out-of-range data), 
the screen will be frozen for some time. If a correct 
signal is received within specific period after that, the 
screen will be updated. If not, "COMMUNICATION 
ERROR" will be displayed on the screen. This 
screen indicates a failure in the multi-center display 
unit (middle grade type) itself, communication error 
with relevant units, components or sensor. In this 
case, you can pinpoint a trouble spot according to 
the CAN communication DTC code chart. 

AC209095AB

ERROR MESSAGE

AC306650AB

A

B

A:

B:

NOTE:

PROCESSING COMMUNICATION ERROR

ABNORMAL DATA 
RECEIVED

NORMAL 
SCREEN

SCREEN 
FREEZE

SCREEN 
UPDATE

NORMAL 
SCREEN

NORMAL 
SCREEN

ERROR 
DISPLAY

COMMUNICATION 
RETURNED TO NORMAL

NORMAL SIGNAL IS RECEIVED WITHIN 60 SECONDS (CAN-BUS)
NORMAL SIGNAL IS RECEIVED WITHIN 60 SECONDS (M-BUS)

NORMAL SIGNAL HAS NOT BEEN RECEIVED FOR 60 OR MORE SECONDS (CAN-BUS)

NORMAL SIGNAL HAS NOT BEEN RECEIVED FOR 30 OR MORE SECONDS (M-BUS)