Mitsubishi Montero (2004+). Manual - part 826

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-561

STEP 1. Verify which door switch is defective.
Q: Which door switch signal is not entered?

Driver's or front passenger's door : Refer to Inspection 

Procedure O-5 "ETACS-ECU does not receive any 
signal from the driver's or the front passenger's door 
switch 

P.54B-520

."

Rear door (LH) : Go to Step 2.
Rear door (RH) : Go to Step 7.
Back door : Go to Step 12.
Driver’s, rear (LH) and back door : Go to Step 17.

STEP 2. Check rear door switch (LH) connector F-09 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is rear door switch (LH) connector F-09 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, which are described in 

"CIRCUIT OPERATION", work normally, the input 
signal from the rear door switch (LH) should be 
normal.

STEP 3. Check the rear door switch (LH).
Remove the rear door switch (LH). Then check continuity 
between the switch terminals and the switch body.

Q: Is the rear door switch (LH) in good condition?

YES : Go to Step 4.
NO :  Replace the rear door switch (LH). If the functions, 

which are described in "CIRCUIT OPERATION", work 
normally, the input signal from the rear door switch 
(LH) should be normal.

STEP 4. Measure at the lower metal part of the rear door 
switch (LH) in order to check the ground circuit to the rear 
door switch (LH).
NOTE: Check that the rear door switch (LH) is grounded to the 
vehicle body by means of its mounting screw.

AC204178

CONNECTOR : F-09

AC

HARNESS SIDE

1

2

3

F-09

SWITCH 
POSITION

TESTER 
CONNECTION

SPECIFIED 
CONDITION

Released (ON)

2 

− switch body

Less than 2 ohms

Depressed (OFF) 2 

− switch body

Open circuit

1 2 3

ACX01865 AC

ON

OFF

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-562

Remove the cap, and measure the resistance value between 
the lower metal part and the ground.

• The resistance should equal 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 5.
NO :  Check the fit of the switch, and repair if necessary. If 

the functions, which are described in "CIRCUIT 
OPERATION", work normally, the input signal from 
the rear door switch (LH) should be normal.

STEP 5. Check ETACS-ECU connector D-222 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is ETACS-ECU connector D-222 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 rear door switch (LH) should be 
normal.

STEP 6. Check the wiring harness between rear door 
switch (LH) connector F-09 (terminal 2) and ETACS-ECU 
connector D-222 (terminal 7).

ACX01600AB

METAL PART

CUP

AC204174

CONNECTOR : D-222

AB

1

2

3

5

6

4

9 8

121110

13

15 14

16

17

7

19

20

18

JUNCTION BLOCK SIDE

D-222

AC204174

CONNECTOR : D-222

AB

1

2

3

5

6

4

9 8

121110

13

15 14

16

17

7

19

20

18

JUNCTION BLOCK SIDE

D-222

AC204178

CONNECTOR : F-09

AC

HARNESS SIDE

1

2

3

F-09

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-563

NOTE: Also check intermediate connector D-125 and junction 
block connector D-217 for loose, corroded, or damaged termi-
nals, or terminals pushed back in the connector. If junction 
block connector D-217 or intermediate connector 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 rear door switch (LH) 

connector F-09 (terminal 2) and ETACS-ECU connector 
D-222 (terminal 7) in good condition?
YES : Replace the ETACS-ECU. If the functions, which are 

described in "CIRCUIT OPERATION", work normally, 
the input signal from the rear door switch (LH) 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 rear door switch (LH) should be normal.

STEP 7. Check rear door switch (RH) connector F-05 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is rear door switch (RH) connector F-05 in good 

condition?
YES : Go to Step 8.
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 rear door switch (RH) should be 
normal.

STEP 8. Check the rear door switch (RH).
Remove the rear door switch (RH). Then check continuity 
between the switch terminals and the switch body.

Q: Is the rear door switch (RH) in good condition?

YES : Go to Step 9.
NO :  Replace the rear door switch (RH). If the functions, 

which are described in "CIRCUIT OPERATION", work 
normally, the input signal from the rear door switch 
(RH) 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

AC204173

CONNECTOR : D-217

AG

HARNESS SIDE

8

1

11 10

3

4

12

9

2

13

14

6 5

15

7

D-217

AC204178

CONNECTOR : F-05

AB

HARNESS SIDE

1

2

3

F-05

SWITCH 
POSITION

TESTER 
CONNECTION

SPECIFIED 
CONDITION

Released (ON)

2 

− switch body

Less than 2 ohms

Depressed (OFF) 2 

− switch body

Open circuit

1 2 3

ACX01865 AC

ON

OFF

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-564

STEP 9. Measure at the lower metal part of the rear door 
switch (RH) in order to check the ground circuit to the rear 
door switch (RH).
NOTE: Check that the rear door switch (RH) is grounded to the 
vehicle body by means of its mounting screw.
Remove the cap, and measure the resistance value between 
the lower metal part and the ground.

• The resistance should equal 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 10.
NO :  Check the fit of the switch, and repair if necessary. If 

the functions, which are described in "CIRCUIT 
OPERATION", work normally, the input signal from 
the rear door switch (RH) should be normal.

STEP 10. Check ETACS-ECU connector D-222 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is ETACS-ECU connector D-222 in good condition?

YES : Go to Step 11.
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 rear door switch (RH) should be 
normal.

ACX01600AB

METAL PART

CUP

AC204174

CONNECTOR : D-222

AB

1

2

3

5

6

4

9 8

121110

13

15 14

16

17

7

19

20

18

JUNCTION BLOCK SIDE

D-222