Mitsubishi Galant (2004+). Manual - part 218

INPUT SIGNAL CHART

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-63

INPUT SIGNAL CHART

M1549024200200

SWS monitor

If a problem is found in the Data List inspection, 
observe the table below.

SYMPTOM

INSPECTION 
PROCEDURE

REFERENCE 
PAGE

ETACS-ECU does not receive any signal from the ignition switch (ACC).

M-1

P.54B-486

ETACS-ECU does not receive any signal from the ignition switch (IG1).

M-2

P.54B-490

ETACS-ECU does not receive any signal from the fog light switch.

M-3

P.54B-493

ETACS-ECU does not receive any signal from the front door switches.

M-4

P.54B-497

Column switch

ETACS-ECU does not receive any signal from the tail 
light switch.

M-5

P.54B-505

ETACS-ECU does not receive any signal from the 
headlight switch.
ETACS-ECU does not receive any signal from the 
passing light switch.
ETACS-ECU does not receive any signal from the 
dimmer switch.
ETACS-ECU does not receive any signal from the 
turn-signal light switch.
ETACS-ECU does not receive any signal from the 
windshield mist wiper switch.

M-6

P.54B-509

ETACS-ECU does not receive any signal from the 
windshield intermittent wiper switch.
ETACS-ECU does not receive any signal from the 
windshield low-speed wiper switch.
ETACS-ECU does not receive any signal from the 
windshield high-speed wiper switch.
ETACS-ECU does not receive any signal from the 
variable intermittent wiper control switch.

M-7

P.54B-512

ETACS-ECU does not receive any signal from the 
windshield washer switch.

M-6

P.54B-509

Sunroof switch

ETACS-ECU does not receive any signal from the up, 
open or close/down switch.

M-8

P.54B-515

INPUT SIGNAL CHART

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-64

Scan tool or voltmeter

If a problem is found in the Pulse Check, observe the 
table below.

SYMPTOM

INSPECTION 
PROCEDURE

REFERENCE 
PAGE

ETACS-ECU does not receive any signal from the key reminder switch.

N-1

P.54B-518

ETACS-ECU does not receive any signal from the hazard warning light 
switch.

N-2

P.54B-523

ETACS-ECU does not receive any signal from any of the door switches.

N-3

P.54B-527

ETACS-ECU does not receive any signal from the door lock key cylinder 
switch.

N-4

P.54B-535

ETACS-ECU does not receive any signal from the front door lock actuator. N-5

P.54B-540

ETACS-ECU does not receive any signal from the door lock switch 
(incorporated in the power window main switch and front power window 
sub switch).

N-6

P.54B-550

ETACS-ECU does not receive any signal from the trunk lid latch assembly. N-7

P.54B-560

Transmitter

ETACS-ECU does not receive any signal from the lock, 
unlock, trunk or panic switch.

N-8

P.54B-563

ETACS-ECU does not receive any interior light loaded signal.

N-9

P.54B-565

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-65

SYMPTOM PROCEDURES

INSPECTION PROCEDURE A-1: Communication with the SWS Monitor Kit is not Possible.

.

DATA LINK
CONNECTOR

JUNCTION
BLOCK SIDE

FRONT
SIDE

ETACS-
ECU

Scan Tool Communication and ETACS-ECU Ground Circuit

AC305231BJ

CONNECTORS: C-03, C-125

C-03

C-125 (B)

AC305415AN

CONNECTOR: C-211

AC305413

C-219

C-218 (GR)

CONNECTORS: C-218, C-219

AM

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-66

TECHNICAL DESCRIPTION (COMMENT)
The SWS monitor kit may be connected improperly.

.

TROUBLESHOOTING HINTS

• The SWS monitor body (I/F cartridge) may be 

defective

• The SWS monitor harness may be defective

• The wiring harness or connectors may have 

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

• 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

STEP 1. Verify SWS monitor kit MB991813 for proper 
connection.
Q: Is SWS monitor kit MB991813 connected with the 

column switch properly?
YES : Go to Step 2.
NO :  Connect SWS monitor kit MB991813 to the column 

switch securely.

STEP 2. Verify the power supply circuit to the ETACS-ECU.
Q: Does the system communicate with scan tool 

MB991958 when the ignition switch is turned to the 
"ON" position?
YES : Refer to Inspection Procedure A-3 "Communication 

with the ETACS-ECU is not possible 

P.54B-79

."

NO :  Go to Step 3.