Mitsubishi Montero (2002-2004). Manual - part 244

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-23

STEP 11. Check column switch connector D-203 and 
ETACS-ECU connector D-224 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are column switch connector D-203 and ETACS-ECU 

connector D-224 in good condition?
YES : Go to Step 12.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. The system should communicate with the 

column switch (column-ECU) normally.

STEP 12. Check the wiring harness between column 
switch connector D-203 (terminal 2) and ETACS-ECU 
connector D-224 (terminal 31).
Q: Is the wiring harness between column switch connector 

D-203 (terminal 2) and ETACS-ECU connector D-224 
(terminal 31) in good condition?
YES : Go to Step 13.
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. The system 
should communicate with the column switch (column-
ECU) normally.

AC204172

CONNECTOR : D-203

AC

HARNESS SIDE

1

2

3

7

8

6

5

10

4

9

D-203

AC204174

CONNECTOR : D-224

AD

D-224(B)

D-224(B)

HARNESS SIDE

21

23

24

22

32

3433

31

26

27

28

3029

38

39

40

36

37

25

35

AC204172

CONNECTOR : D-203

AC

HARNESS SIDE

1

2

3

7

8

6

5

10

4

9

D-203

AC204174

CONNECTOR : D-224

AD

D-224(B)

D-224(B)

HARNESS SIDE

21

23

24

22

32

3433

31

26

27

28

3029

38

39

40

36

37

25

35

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-24

STEP 13. Replace the ECU.
(1) Replace the column switch.
(2) The system should communicate with the column switch 

(column-ECU) normally.

Q: Can the system communicate with the column switch 

(column-ECU)?
YES : No action is necessary and testing is complete.
NO :  Replace the ETACS-ECU. The system should 

communicate with the column switch (column-ECU) 
normally.

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-25

INSPECTION PROCEDURE A-3: Communication with the ETACS-ECU is not possible.

ETACS-ECU Power Supply and SWS Communication Circuit

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-26

.

CIRCUIT OPERATION

• The power supply to the ETACS-ECU is provided 

by the battery and the ignition switch (IG1).

• If the power supply system from the battery is 

defective, the system operates by the power sup-
ply from the ignition switch (IG1).

.

TECHNICAL DESCRIPTION (COMMENT)
It is suspected that the power supply circuit to the 
ETACS-ECU is defective, or the wiring harness 
between the SWS monitor kit and the ETACS-ECU 
or their connector(s) is damaged. If the battery power 
supply circuit to the ECU (terminal 6 of the ETACS-

ECU) is damaged, also check the power supply cir-
cuit from the ignition switch (IG1) (terminal 16 of the 
ETACS-ECU), and repair if necessary. If the ground 
circuit to the ECU (terminal 20 of the ETACS-ECU) is 
damaged, also check the ground circuit to the sensor 
(terminal 23 of the ETACS-ECU), and repair if neces-
sary.

.

TROUBLESHOOTING HINTS

• The ETACS-ECU may be defective

• The wiring harness or connectors may have 

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

AC204170

CONNECTOR : D-28

BB

AC204172

CONNECTOR : D-203

AG

AC204173

CONNECTORS : D-209, 221               

AL

D-209

D-221

AC204174

CONNECTORS : D-222, D-224

D-224(B)

AH

D-222