Mitsubishi Galant 9G. Manual — part 99

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-392

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

• MB991813: SWS Monitor Kit

• MB991806: SWS Monitor Cartridge

• MB991812: SWS Monitor Harness (For Column-ECU)

• MB991822: Probe Harness

STEP 1. Check the turn-signal lights.
When the column switch or the hazard warning light switch are
operated, check that the turn-signal lights illuminate and go off
normally.
Q: Are the turn-signal lights in good condition?

YES : Go to Step 2.
NO : First, repair the turn-signal light(s). Refer to Inspection

Procedure I-3 "One of the turn-signal lights does not
illuminate

P.54B-377

."

STEP 2. Using scan tool MB991958, diagnose the CAN bus
line.

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.
(1) Connect scan tool MB991958.Refer to "How to connect

SWS monitor

P.54B-13

."

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 3.
NO : Repair the CAN bus line (Refer to GROUP 54C,

Diagnosis

P.54C-14

).

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-393

STEP 3. Using scan tool MB991958, read the combination
meter diagnostic trouble code.
Check whether the combination meter-related DTC is set.
(1) Turn the ignition switch to the "ON" position.
(2) Check whether a combination meter-related DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the combination meter. Refer to

P.54A-52

.

NO : Go to Step 4.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-394

STEP 4. Use scan tool MB991958 to select "ECU COMM
Check" on the SWS monitor display.
Check the ETACS-ECU.

CAUTION

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 SWS monitor. Refer to "How to connect SWS

monitor

P.54B-13

."

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

below to display "ECU COMM Check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "ECU COMM Check."

(4) Scan tool MB991958 should show "OK" on the "ECU

COMM Check" menu for the "ETACS ECU" menu.

Q: Is "OK" displayed for the "ETACS ECU" menu?

YES : Go to Step 5.
NO : Refer to Inspection Procedure A-3 "Communication

with the ETACS-ECU is not possible

P.54B-78

."

STEP 5. Replace the combination meter.
(1) Replace the combination meter.
(2) Check that the turn-signal light indicator lights illuminate

normally.

Q: Are the turn-signal indicator lights in good condition?

YES : No action is necessary and testing is complete.
NO : Replace the ETACS-ECU. Check that the turn-signal

light indicator lights illuminate normally.

AC305411AB

MB991910

DATA LINK

CONNECTOR

MB991827

MB991824

MB991806

MB991812

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

AB

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-395

FOG LIGHT

GENERAL DESCRIPTION CONCERNING THE FOG LIGHTS

M1549021400216

The following ECUs affect the functions and control
of the fog lights.

Fog light

The fog lights will illuminate only when the fog light
switch is operated while the low-beam headlights are
on.
The fog lights will be switched off when any of the fol-
lowing conditions is met. The fog lights will also be
switched off automatically by headlight automatic
shutoff function.

• When the high-beam headlights are switched on,

the fog lights will be switched off. If the low-beam
headlights are switched on again, the fog lights
will illuminate again.

• When the headlight switch is turned off or the tail

lights and headlights are off, the fog lights will be
switched off. If the low-beam headlights are
switched on again, the fog lights will not illumi-
nate again.

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

FUNCTION

CONTROL ECU

Fog light

ETACS-ECU, front-ECU, column switch

Fog light indicator

ETACS-ECU, column switch

AC306459

ON

OFF

ON

OFF

ON

OFF

ON

OFF

Tail light switch

Headlight switch

Dimmer switch

Fog light switch

ON

OFF

Fog light

AB