Mitsubishi Montero (2004+). Manual - part 805

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-477

 STEP 1. Use scan tool MB991958 to select "ECU COMM 
CHK" on the SWS monitor display.
Check the ETACS-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.
(1) Connect the special tool. Refer to "How to connect SWS 

monitor 

P.54B-7

.

(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Operate scan tool MB991958 according to the procedure 

below to display "ECU COMM CHK."

1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "ECU COMM CHK."

(4) Scan tool MB991958 should show "OK" on the "ECU 

COMM CHK" menu for the "ETACS ECU" menu.

Q: Is "OK" displayed on the "ETACS ECU" menu?

YES : Go to Step 2.
NO :  Refer to Inspection Procedure A-3 "Communication 

with the ETACS-ECU is not possible 

P.54B-42

."

 STEP 2. Check ETACS-ECU connector D-224 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q:  Is ETACS-ECU connector D-224 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

. The theft-alarm indicator light should 

illuminate, and the theft-alarm system should be set 
normally.

AC309091

MB991911

MB991827

MB991824 

AB

MB991806

MB991862

DATA LINK
CONNECTOR 
(16-PIN)

DATA LINK
CONNECTOR 
(13-PIN)

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

SIMPLIFIED WIRING SYSTEM (SWS)

54B-478

 STEP 3. Check at ETACS-ECU connector D-224 in order to 
check the theft-alarm indicator light circuit.
(1) Disconnect ETACS-ECU connector D-224, and measure at 

the wiring harness side. 

(2) The theft-alarm indicator light should illuminate when 

terminal 40 is grounded.

Q:  Does the theft-alarm indicator light illuminate?

YES : Go to Step 9.
NO :  Go to Step 4.

 STEP 4. Check theft-alarm indicator light connector D-105 
for loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q:  Is theft-alarm indicator light connector D-105 in good 

condition?
YES : Go to Step 5.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. The theft-alarm indicator light should 

illuminate, and the theft-alarm system should be set 
normally.

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

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

AC100319AB

CONNECTOR D-224
(HARNESS SIDE)

AC204170

CONNECTOR : D-105

AL

HARNESS 
SIDE

D-105(B)

D-105(B)

1

2

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-479

 STEP 5. Check the theft-alarm indicator light.
(1) Remove the RV meter. Refer to GROUP 54A, RV meter 

P.54A-286

.

(2) Disconnect theft-alarm indicator light connector D-105.

(3) The theft-alarm indicator light should illuminate when 

battery voltage is applied between terminals 1 and 2.

Q:  Does the theft-alarm indicator light illuminate?

YES : Go to Step 6.
NO :  Replace the theft-alarm indicator light. The theft-alarm 

indicator light should illuminate, and the theft-alarm 
system should be set normally. 

 STEP 6. Check the fusible link (1) line of power supply 
circuit to the theft-alarm indicator light circuit. Test at 
theft-alarm indicator light connector D-105.
(1) Disconnect theft-alarm indicator light connector D-105 and 

measure the voltage available at the wiring harness side of 
the connector. 

(2) Measure the voltage between terminal 2 and ground.

• The voltage should be approximately 12 volts (battery 

positive voltage).

Q:  Is the measured voltage approximately 12 volts (battery 

positive voltage)?
YES : Go to Step 8.
NO :  Go to Step 7.

AC204170

CONNECTOR : D-105

AL

HARNESS 
SIDE

D-105(B)

D-105(B)

1

2

ACX02296

AC204170

CONNECTOR : D-105

AL

HARNESS 
SIDE

D-105(B)

D-105(B)

1

2

AC100067

1

2

AB

CONNECTOR D-105
(HARNESS SIDE)

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-480

 STEP 7. Check the wiring harness between theft-alarm 
indicator light connector D-105 (terminal 1) and the fusible 
link (1). 

NOTE: Also check intermediate connector D-28 and joint con-
nector D-02 for loose, corroded, or damaged terminals, or ter-
minals pushed back in the connector. If intermediate connector 
D-28 or joint connector D-02 is damaged, repair or replace the 
damaged component(s) as described in GROUP 00E, Harness 
Connector Inspection 

P.00E-2

.

Q:  Is the wiring harness between theft-alarm indicator 

light connector D-105 (terminal 1) and the fusible link (1) 
in good condition?
YES : No action is necessary and testing is complete.
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 
theft-alarm indicator light should illuminate, and the 
theft-alarm system should be set normally.

ACX02274

FUSIBLE LINK (1)

AE

BATTERY

AC204170

CONNECTOR : D-105

AL

HARNESS 
SIDE

D-105(B)

D-105(B)

1

2

AC204188

CONNECTORS: D-02, D-28

D-02

D-02

D-28

AB

D-28

9 10

8

6 7

31 32

30

29

18 19 20 21

5

4

2

1

3

27

26

24

23

25

12 13 14 15 16 17

28

11
22
33

2 3

27

32

28

33

16

15

4 5

19

18

29

17

34

7 8

35

22

21

9 10

30

36

31

37

25

24

23

6

20

1

14

26

11

13

12

38