Mitsubishi Montero (2002-2004). Manual - part 399

INPUT SIGNAL PROCEDURES

TSB Revision

SWS INPUT SIGNAL PROCEDURES

54Bc-143

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.

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

SWS INPUT SIGNAL PROCEDURES

54Bc-144

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

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.

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

AC204170

CONNECTOR : D-27

AH

10

4

8

7

3

9

5

1

6

2

INPUT SIGNAL PROCEDURES

TSB Revision

SWS INPUT SIGNAL PROCEDURES

54Bc-145

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

• MB991502: Scan Tool (MUT-II)

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-

56

.

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.

Transmitter Input Circuit

INPUT SIGNAL PROCEDURES

TSB Revision

SWS INPUT SIGNAL PROCEDURES

54Bc-146

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.42-56

.

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