Mitsubishi Galant 9G. Manual — part 122

INPUT SIGNAL PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-484

NOTE: Also check intermediate connector C-13 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector C-13 is damaged, repair or
replace the connector as described in GROUP 00E, Harness
Connector Inspection

P.00E-2

.

Q: Is the wiring harness between front door switch (RH)

connector D-34 (terminal 1) and ETACS-ECU connector
C-218 (terminal 65) in good condition?
YES : Replace the ETACS-ECU. If the functions described

in "CIRCUIT OPERATION" work normally, the input
signal from the front door switch (RH) should be
normal.

NO : The wiring harness may be damaged or the

connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. If the
functions described in "CIRCUIT OPERATION" work
normally, the input signal from the front door switch
(RH) should be normal.

INSPECTION PROCEDURE M-5: Column Switch: ETACS-ECU does not receive any signal from the
taillight switch, the headlight switch, the passing light switch, the dimmer switch or the turn-signal
light switch.

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

."

.

AC305233 AC

CONNECTOR: C-13

Turn-signal Light and Lighting Switch Input Circuit

AC004262

INPUT SIGNAL PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-485

CIRCUIT OPERATION

The ETACS-ECU operates the following equipment
or functions according to signal from the column
switch (turn-signal light and lighting switch):

• Light reminder tone alarm function

• Turn-signal light buzzer

• Headlight

• Turn-signal light

• High-beam indicator

• Turn-signal indicators

.

TECHNICAL DESCRIPTION (COMMENT)

If the signal is not normal, the equipment or functions
described in "CIRCUIT OPERATION" do not work
normally. If the signal is not normal, the column
switch (turn-signal light and lighting switch) or the
ETACS-ECU may be defective.

.

TROUBLESHOOTING HINTS

• The column switch (turn-signal light and lighting

switch) may be defective

• The ETACS-ECU may be defective

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

INPUT SIGNAL PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-486

STEP 1. Use scan tool MB991958 to select "ECU COMM
Check" on the SWS monitor display.
Check the column-ECU.

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 "ON" position.
(3) Operate the scan tool 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 (MUT-III) should show "OK" on the "ECU COMM

Check" menu for the "COLUMN ECU" menu.

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

YES : Go to Step 2.
NO : Refer to Inspection Procedure A-2 "Communication

with the column switch (column-ECU) is not possible

P.54B-71

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AC305411AB

MB991910

DATA LINK

CONNECTOR

MB991827

MB991824

MB991806

MB991812

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

AB

INPUT SIGNAL PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-487

STEP 2. Check the turn-signal light and lighting switch.
Remove the turn-signal light and the lighting switch. Then
check continuity between the switch terminals.

Q: Are the turn-signal light and lighting switch in good

condition?
YES : Go to Step 3.
NO : Replace the turn-signal light and the lighting switch.

The input signal from the column switch (turn-signal
light and lighting switch) should be able to be checked
and the functions described in the "CIRCUIT
OPERATION" should work normally.

STEP 3. Replace the column switch.
(1) Replace the column switch.
(2) The input signal from the column switch (turn-signal light

and lighting switch) should be able to be checked and the
functions described in the "CIRCUIT OPERATION" should
work normally.

Q: Is the input signal from the column switch (turn-signal

light and lighting switch) input normally?
YES : No action is necessary and testing is complete.
NO : Replace the ETACS-ECU. The input signal from the

column switch (turn-signal light and lighting switch)
should be able to be checked and the functions
described in the "CIRCUIT OPERATION" should work
normally.

SWITCH
POSITION

TESTER
CONNECTION

SPECIFIED
CONDITION

OFF

1

− 2, 2 − 3, 2 − 11,

2

− 12, 5 − 9, 7 − 9

Open circuit

Taillight switch

5

− 9

Less than 2 ohms

Headlight switch

5

− 9, 7 − 9

Less than 2 ohms

Passing switch

2

− 12

Less than 2 ohms

Dimmer switch

2

− 11, 2 − 12

Less than 2 ohms

Turn-signal light
switch (LH)

1

− 2

Less than 2 ohms

Turn-signal light
switch (RH)

2

− 3

Less than 2 ohms

AC003177

UPPER SIDE

AB