Mitsubishi Galant 9G. Manual — part 91

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-360

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

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-361

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 "LOCK" (OFF) 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 high beam indicator light illuminates

normally.

Q: Does the high beam indicator light illuminate normally?

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

indicator light illuminates normally.

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-362

INSPECTION PROCEDURE H-9: Headlight and Taillight: Headlight automatic shutoff function does
not work normally.

NOTE: This troubleshooting procedure requires the
use of scan tool MB991958 and SWS monitor kit
MB991813. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor

P.54B-15

."

.

CIRCUIT OPERATION

The ETACS-ECU operates the headlight automatic
shutdown function according to the following signals:

• Ignition switch (IG1): OFF

• Driver's door switch: ON

• Taillight switch: ON

• Headlight switch: ON

The ETACS-ECU operates the headlight automatic
shutdown function under the following conditions:

• Ignition key: Other than "ON" position

• Driver's door: open

• Taillights or headlights: on

.

TECHNICAL DESCRIPTION (COMMENT)

If the function does not work normally, the input cir-
cuit system from the switches, the ETACS-ECU or
the front-ECU may be defective (refer to "CIRCUIT
OPERATION").

.

TROUBLESHOOTING HINTS

• Trouble in input signal system

• The wiring harness or connectors may have

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

• The front-ECU may be defective

·

DRIVER'S DOOR

SWITCH

· IGNITION SWITCH (IG1)
· TAILLIGHT SWITCH

ETACS-
ECU

INPUT SIGNAL

Headlight Automatic Shutt-Down Function

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-363

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 adjustment function.
Q: Has a setting other than "No auto-shutoff" been

selected for the headlight automatic shutdown
function?
YES : Go to Step 2.
NO : Set the headlight automatic shutdown function to

another setting other than "No auto-shutoff".