Mitsubishi Galant (2004+). Manual - part 337

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-539

STEP 6. Check the wiring harness between door lock key 
cylinder switch connector E-14 (terminals 1 and 3) and 
ETACS-ECU connector C-217 (terminals 25 and 42).

NOTE: Also check intermediate connector C-26 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the 
connector. If intermediate connector C-26 is damaged, repair or 
replace the connector as described in GROUP 00E, Harness 
Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between door lock key cylinder 

switch connector E-14 (terminals 1 and 3) and 
ETACS-ECU connector C-217 (terminals 25 and 42) in 
good condition?
YES : Replace the ETACS-ECU. If the systems described in 

"CIRCUIT OPERATION" work normally, the input 
signal from the door lock key cylinder switch 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 
systems described in "CIRCUIT OPERATION" work 
normally, the input signal from the door lock key 
cylinder switch should be normal.

AC305413AH

CONNECTOR: C-217

HARNESS SIDE

25

26

27

28

29

21

22

23

24

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

JUNCTION BLOCK

(REAR VIEW)

AC305262

E-14 (B)

HARNESS SIDE

AN

CONNECTOR: E-14

AC305231

CONNECTOR: C-26

AK

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-540

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

FRONT DOOR 
LOCK ACTUATOR (LH)

FRONT DOOR 
LOCK ACTUATOR (RH)

ETACS-ECU

Door Lock Actuator Input Circuit

AC305233

CONNECTOR: C-12

AE

AC305231

CONNECTOR: C-26

AL

AC305413

CONNECTOR: C-217

AK

JUNCTION BLOCK

(REAR VIEW)

AC305333

E-05 (B)

CONNECTOR: E-05

AG

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-541

.

CIRCUIT OPERATION
The ETACS-ECU operates the following functions or 
systems according to signal from the front door lock 
actuator:

• Central door locking system

• Ignition key reminder tone alarm

• Keyless entry system

• Dome light <front door lock actuator (LH)>

.

TECHNICAL DESCRIPTION (COMMENT)
If the signal is not normal, the functions or systems 
described in "CIRCUIT OPERATION" do not work 
normally.

.

TROUBLESHOOTING HINTS

• The front door lock actuator 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

AC305262

E-15 (B)

CONNECTOR: E-15

AM

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-542

STEP 1. Check the input signal (by using the pulse check 
mode of the monitor).

Check the input signals from the front door lock actuators.

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 the scan tool MB991958. Refer to "How to connect 

SWS monitor 

P.54B-13

."

(2) Operate scan tool MB991958 according to the procedure 

below to display "Pulse check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "Pulse Checking."

(3) Check that scan tool MB991958 sounds.
Q: When the front door lock actuators are operated, does 

the scan tool MB991958 sound?
When the front door lock actuator (LH) is operated, the 
scan tool MB991958 does not sound. : Go to Step 2.
When the front door lock actuator (RH) is operated, the 
scan tool MB991958 does not sound. : Go to Step 8.

STEP 2. Check front door lock actuator (LH) connector 
E-15 for loose, corroded or damaged terminals, or 
terminals pushed back in the connector. 

Q: Is front door lock actuator (LH) connector E-15 in good 

condition?
YES : Go to Step 3.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. If the functions described in "CIRCUIT 

OPERATION" work normally, the input signal from the 
front door lock actuator (LH) should be normal.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC305262

E-15 (B)

HARNESS SIDE

CONNECTOR: E-15

AH