Mitsubishi Montero (2004+). Manual - part 825

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-557

STEP 5. Check driver's seat belt switch connector F-18 and 
ETACS-ECU connector D-224 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are driver's seat belt switch connector F-18 and 

ETACS-ECU connector D-224 in good condition?
YES : Go to Step 6.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. If the functions, which are described in 

"CIRCUIT OPERATION", work normally, the input 
signal from the driver's seat belt switch should be 
normal.

STEP 6. Check the wiring harness between driver's seat 
belt switch connector F-18 (terminal 2) and ETACS-ECU 
connector D-224 (terminal 25).

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

AC204177

CONNECTOR : F-18

AD

HARNESS SIDE

2 1

F-18

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

AC204177

CONNECTOR : F-18

AD

HARNESS SIDE

2 1

F-18

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-558

NOTE: Also check intermediate connector D-125 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the 
connector. If intermediate connectors D-125 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 driver's seat belt switch 

connector F-18 (terminal 2) and ETACS-ECU connector 
D-224 (terminal 25) in good condition?
YES : Replace the ETACS-ECU. If the functions, which are 

described in "CIRCUIT OPERATION", work normally, 
the input signal from the driver's seat belt 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 
functions, which are described in "CIRCUIT 
OPERATION", work normally, the input signal from 
the driver's seat belt switch should be normal.

AC204170

CONNECTOR : D-125

AO

9

8

6 7

5

3 4

20

32

21

33

43

17 18

30

41

16

29

28

39 40

13

25

12

24

35 36

14

26

37

15

27

38

19

31

42

1

10

22

2

11

23

34

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-559

INSPECTION PROCEDURE P-4: ETACS-ECU does not receive any signal from all the door switches.

All Door Switches Input Circuit

AC204171

CONNECTOR : D-111

AG

AC204170

CONNECTOR : D-125

BE

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-560

.

CIRCUIT OPERATION
The ETACS-ECU operates the following functions or 
systems according to signal from the driver's or front 
passenger's, rear or back door switches:

• Light reminder tone alarm function <Driver’s door 

switch>

• Power window timer function <Driver’s, front pas-

senger’s door switch>

• Headlight automatic shutdown function <Driver’s 

door switch>

• Keyless entry system <All door switches>

• Dome light <All door switches>

.

TECHNICAL DESCRIPTION (COMMENT)
If the signal is not normal, the functions or systems, 
which are described in "CIRCUIT OPERATION", do 
not work normally. If the signal is not normal, the 
driver's, front passenger's, rear or back door switch 
or the ETACS-ECU may be defective.

.

TROUBLESHOOTING HINTS

• The driver's, front passenger's, rear or back door 

switch may be defective

• 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

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

• MB991911: MUT-III Main Harness B

AC204173

CONNECTORS : D-209, 217

AK

D-209

D-217

AC204174

CONNECTOR : D-222            

AE

AC204178

CONNECTORS : F-05, F-09

F-05

F-09

AM

AC204179

CONNECTOR : G-15

AL