Mitsubishi Montero (2004+). Manual - part 842

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-625

STEP 5. Check hood switch connector A-14 and 
ETACS-ECU connector D-223 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are hood switch connector A-14 and ETACS-ECU 

connector D-223 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 theft-alarm system operates normally, 

it indicates that a correct signal is sent from the hood 
switch.

STEP 6. Check the wiring harness between hood switch 
connector A-14 (terminal 1) and ETACS-ECU connector 
D-223 (terminal 48).

AC204167

CONNECTOR : A-14

HARNESS 
SIDE

A-14(B)

A-14(B)

AC

1

2

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

AC204167

CONNECTOR : A-14

HARNESS 
SIDE

A-14(B)

A-14(B)

AC

1

2

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

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-626

NOTE: Also check intermediate connector D-27 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the 
connector. If intermediate connector D-27 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 hood switch connector 

A-14 (terminal 1) and ETACS-ECU connector D-223 
(terminal 48) in good condition?
YES : Replace the ETACS-ECU. If the theft-alarm system 

operates normally, it indicates that a correct signal is 
sent from the hood switch.

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 
theft-alarm system operates normally, it indicates that 
a correct signal is sent from the hood switch.

INSPECTION PROCEDURE P-10: Transmitter: ETACS-ECU does not receive any signal from the lock, 
unlock switch or panic switch.

.

CIRCUIT OPERATION
The ETACS-ECU receives signal through its receiver 
from the transmitter, and operates the keyless entry 
system according to the signal.

.

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

.

TROUBLESHOOTING HINTS

• The transmitter may be defective

• The ETACS-ECU may be defective

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

AC204170

CONNECTOR : D-27

AH

10

4

8

7

3

9

5

1

6

2

Transmitter Input Circuit

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-627

STEP 1. Register the transmitter.
Replace the transmitter. Refer to GROUP 42, Keyless Entry 
System, On-vehicle Service, How to register secret code 

P.42-59

.

Q: Can the transmitter be registered correctly?

YES : If the systems, which are described in "CIRCUIT 

OPERATION", work normally, the input signal from 
the transmitter should be normal.

NO :  Go to Step 2.

STEP 2. Check the transmitter battery.
Measure the voltage of the transmitter battery.

• The voltage should equal approximately 2.5 - 3.2 volts.

Q: Is the measured voltage approximately 2.5 - 3.2 volts?

YES : Go to Step 3.
NO :  Replace the battery. If the transmitter can be 

registered normally, and the systems, which are 
described in "CIRCUIT OPERATION", operate 
normally, it indicates that the transmitter is sending 
normal signal to the ECU.

STEP 3. Check the transmitter.
Substantial other transmitter in order to register encrypted 
code. Refer to GROUP 42, Keyless Entry System, On-vehicle 
Service, How to register secret code 

P.42-59

.

Q: Can the transmitter be registered correctly?

YES : If the systems, which are described in "CIRCUIT 

OPERATION", work normally, the input signal from 
the transmitter should be normal.

NO :  Replace the ETACS-ECU. If the systems, which are 

described in "CIRCUIT OPERATION", work normally, 
the input signal from the transmitter should be normal.

ACX01609

CHECK AT ECU TERMINAL

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-628

CHECK AT ECU TERMINAL

M1549001200436

1. ETACS-ECU

NOTE: *: The terminal 1 to 20 connectors can not be 
measured as the ETACS-ECU is installed directly on 
the junction block. Therefore, this information is only 
for reference.

19 20

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

21 22 23 24 25 26 27 28 29 30

31 32 33 34 35 36 37 38 39 40

41 42 43 44 45 46 47 48

49 50 51 52 53 54 55 56

ACX01511

*

AB

TERMINAL 
NO.

INSPECTION ITEM

INSPECTION CONDITION

NORMAL VALUE

1

Output to rear wiper

When rear wiper is operating

Battery positive voltage

2

Power supply to ignition switch 
(ACC)

Ignition switch: "ACC"

Battery positive voltage

3

Output to rear washer

When rear washer is operating

Battery positive voltage

4

Output to door lock

When door lock actuator is 
operating (doors locked)

Battery positive voltage

5

Input of automatic stop signal to 
rear wiper

When rear wiper is operating

Battery positive voltage

6

Battery power supply (for ECU)

Always

Battery positive voltage

7

Input from door switches

Either of door switches: ON 
(Door open)

0 V

8

Output to power window relay

When the power windows can 
work

2 V or less

9

Input from driver's door switch

Driver's door switch: ON (Driver's 
door open)

0 V

11

Battery power supply (for 
turn-signal light)

Always

Battery positive voltage

12

Battery positive voltage (for 
central door lock)

Always

Battery positive voltage

14

Output to turn-signal light (LH)

When turn-signal light (LH) is on Battery positive voltage

15

Output to turn-signal light (RH)

When turn-signal light (RH) is on Battery positive voltage

16

Power supply to ignition switch 
(IG1)

Ignition switch: "ON"

Battery positive voltage

17

Output to door unlock (excluding 
direr's door)

When door lock actuator is 
operating (doors unlocked) 

Battery positive voltage

18

Output to dome light

When dome light is on

2 V or less

19

Output to door unlock (for 
driver's door)

When driver's door lock actuator 
is operating (doors unlocked)

Battery positive voltage

20

Ground (for ECU)

Always

0 V

21

SWS communication line

Always

0 

− 12 V (pulse signal)

22

Input of diagnosis indication 
selection

When scan tool is connected

0 V

23

Ground (for sensor)

Always

0 V