Mitsubishi Montero (2002-2004). Manual - part 387

INPUT SIGNAL PROCEDURES

TSB Revision

SWS INPUT SIGNAL PROCEDURES

54Bc-95

.

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 lock actuator switch:

• Central door locking system

• Keyless entry system

• Dome light dimming function

.

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

.

TROUBLESHOOTING HINTS

• The door lock actuator 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

• MB991502: Scan Tool (MUT-II)

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

Driver's door : Go to Step 2.
Front passenger's door : Go to Step 8.
Rear door (LH) : Go to Step 14.
Rear door (RH) : Go to Step 20.
Back door : Go to Step 26.
Front doors : Go to Step 32.
Rear and back doors : Go to Step 33.
Rear (LH) and back doors : Go to Step 35.

AC204182 AG

CONNECTOR : I-05

I-05(B)

INPUT SIGNAL PROCEDURES

TSB Revision

SWS INPUT SIGNAL PROCEDURES

54Bc-96

STEP 2. Check the driver's door lock actuator switch.
Disconnect driver's door lock actuator switch connector H-10. 
Then check continuity between the switch terminals.

Q: Is the driver's door lock actuator switch in good 

condition?
YES : Go to Step 3.
NO :  Replace the driver's door lock actuator switch. If the 

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

STEP 3. Check the ground circuit to the driver's door lock 
actuator switch. Test at driver's door lock actuator switch 
connector H-10.
(1) Disconnect driver's door lock actuator switch connector H-

10 and measure the resistance available at the wiring 
harness side of the connector.

(2) Measure the resistance value between terminal 1 and 

ground.

• The resistance should equal 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 6.
NO :  Go to Step 4.

LEVER 
POSITION

TESTER 
CONNECTION

SPECIFIED 
CONDITION

LOCK

1 

− 3

Less than 2 ohms

UNLOCK

1 

− 2

Less than 2 ohms

ACX00543

LOCK

UNLOCK

VIEW A

A

AE

LEVER

AC204180

CONNECTOR : H-10

AD

HARNESS SIDE

H-10(B)

H-10(B)

<DRIVER'S SIDE>

1

3 2

4

6 5

5

4

3

2

1

6

ACX01603AB

CONNECTOR H-10
(HARNESS SIDE)

INPUT SIGNAL PROCEDURES

TSB Revision

SWS INPUT SIGNAL PROCEDURES

54Bc-97

STEP 4. Check driver's door lock actuator switch 
connector H-10 for loose, corroded or damaged terminals, 
or terminals pushed back in the connector. 
Q: Is driver's door lock actuator switch connector H-10 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

. If the functions, which are described in 

"CIRCUIT OPERATION", work normally, the input 
signal from the driver's door lock actuator switch 
should be normal.

STEP 5. Check the wiring harness between driver's door 
lock actuator switch connector H-10 (terminal 1) and 
ground.

NOTE: Also check intermediate connector D-25 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the 
connector. If intermediate connector D-25 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 door lock 

actuator switch connector H-10 (terminal 1) and ground 
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. If the 
functions, which are described in "CIRCUIT 
OPERATION", work normally, the input signal from 
the driver's door lock actuator switch should be 
normal.

AC204180

CONNECTOR : H-10

AD

HARNESS SIDE

H-10(B)

H-10(B)

<DRIVER'S SIDE>

1

3 2

4

6 5

AC204180

CONNECTOR : H-10

AD

HARNESS SIDE

H-10(B)

H-10(B)

<DRIVER'S SIDE>

1

3 2

4

6 5

AC204170

CONNECTOR : D-25

AE

10

9

31

30

20 21

7

6

28

17 18

8

19

29

4

3

25 26

14 15

1

23

12

2

13

24

5

16

27

11

22

32

INPUT SIGNAL PROCEDURES

TSB Revision

SWS INPUT SIGNAL PROCEDURES

54Bc-98

STEP 6. Check driver's door lock actuator switch 
connector H-10 and ETACS-ECU connector D-223 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Are driver's door lock actuator switch connector H-10 

and ETACS-ECU connector D-223 in good condition?
YES : Go to Step 7.
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 door lock actuator switch 
should be normal.

AC204174

CONNECTOR : D-223

AC

D-223(B)

D-223(B)

HARNESS SIDE

42

43

50

51

45

46

53

54

52

44

48

5655

47

49

41

AC204180

CONNECTOR : H-10

AD

HARNESS SIDE

H-10(B)

H-10(B)

<DRIVER'S SIDE>

1

3 2

4

6 5