Mitsubishi Galant (2004+). Manual — part 296

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-375

STEP 2. Check the input signal by using "DATA LIST"
menu of the SWS monitor.

Check the input signals from the following switches:

• Ignition switch: "ON" to "OFF"

• Lighting switch: "TAIL" or "HEAD"

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958. Connect
special tool MB991910 before connecting special tool
MB991812. Be sure to connect special tool MB991806 after
turning on special tool MB991824.
(1) Connect the special tool. Refer to "How to connect SWS

monitor

P.54B-13

."

(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Operate scan tool MB991958 according to the procedure

below to display "H/L AUTO-CUT."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f. Select "LIGHTING."
g. Select "H/L AUTO-CUT."

(4) Check that normal conditions are displayed for the items

described in the table below.

ITEM NO.

ITEM NAME

NORMAL CONDITION

ITEM 01

TAILLIGHT SW

ON

ITEM 30

IG SW (IG1)

OFF

AC305411AB

MB991910

DATA LINK

CONNECTOR

MB991827

MB991824

MB991806

MB991812

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

AB

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-376

(5) When the driver's door is opened, check that normal

conditions are displayed for the items described in the table
below.

Q: Does the scan tool MB991958 display the items

"TAILLIGHT SW", "IG SW IG1", "FRONT DOOR SW" and
"H/L AUTO-CUT" as normal condition?
Normal conditions are displayed for all the items :

Replace the front-ECU. Verify that the headlight
automatic shutdown function works normally.

Normal condition is not displayed for "TAILLIGHT SW" :

Refer to Inspection Procedure M-5 "ETACS-ECU
does not receive any signal from the taillight switch

P.54B-505

."

Normal condition is not displayed for "IG SW (IG1)" :

Refer to Inspection Procedure M-2 "ETACS-ECU
does not receive any signal from the ignition switch
(IG1)

P.54B-490

."

Normal condition is not displayed for "FRONT DOOR
SW" : Refer to Inspection Procedure M-4 "ETACS-ECU

does not receive any signal from the front door
switches

P.54B-497

."

Normal condition is not displayed for "H/L AUTO-CUT" :

Replace the front-ECU. Check that the headlight
automatic shutdown function works normally.

ITEM NO.

ITEM NAME

NORMAL CONDITION

ITEM 32

FRONT DOOR SW ON

ITEM 35

H/L AUTO-CUT

ON

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-377

INSPECTION PROCEDURE H-10: Headlight and Taillight: Headlight dimmer switch automatic
resetting function does not work normally.

.

CIRCUIT OPERATION
The headlight dimmer switch automatic resetting
function is controlled by the front-ECU.

.

TECHNICAL DESCRIPTION (COMMENT)
If the headlight dimmer switch automatic resetting
function does not work normally, the front-ECU may
be defective.

.

TROUBLESHOOTING HINT
The front-ECU may be defective

DIAGNOSIS

Replace the front-ECU.
Check that the headlight dimmer switch automatic resetting
function works normally.

·

DIMMER

SWITCH

· HEADLIGHT SWITCH

ETACS-
ECU

INPUT SIGNAL

Headlight (Dimmer/Passing) Input Signal

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-378

FLASHER TIMER

GENERAL DESCRIPTION CONCERNING THE FLASHER TIMER

M1549023600108

The following ECUs affect the functions and control
of the flasher timer.

FLASHER TIMER FUNCTION

.

Turn signal light
The turn signal light output (flashing signal) is turned ON when
the ignition switch is ON and the turn signal light switch is ON
(LH or RH). If the front turn signal light or rear turn signal light
bulb has burned out, the flashing speed increases to indicate
that the bulb has burned out.

.

Turn signal indicators
At the same time that the turn-signal lights are illuminated, the
ETACS-ECU sends a signal to illuminate the turn-signal light
indicator via the CAN bus line. The combination meter receives
the transmitted signal and turns the turn-signal light indicator
on and off.

.

Hazard warning light
Detects the signal where the hazard warning light switch input
changes from OFF to ON, and reverse the flashing state
according to this signal. The hazard warning lights toggle on
and off whenever the hazard warning light switch is operated.
NOTE: The hazard warning light switch is a push-return type
toggle switch.

General circuit diagram for the turn signal light and hazard light

FUNCTION

CONTROL ECU

Turn signal light

ETACS-ECU, column switch

Turn signal indicators

ETACS-ECU, column switch

Hazard warning light

ETACS-ECU

AC005444AB

Ignition switch

Turn signal

light switch LH

Turn signal

light switch RH

Turn signal

light output LH

Turn signal

light output RH

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

AC005445AB

Hazard light

switch

Turn signal

light output LH

Turn signal

light output RH

ON

OFF

ON

OFF

ON

OFF