Mitsubishi Montero (2002-2004). Manual - part 376

INPUT SIGNAL PROCEDURES

TSB Revision

SWS INPUT SIGNAL PROCEDURES

54Bc-51

STEP 3. Check key reminder switch connector D-202 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is key reminder switch connector D-202 in good 

condition?
YES : Go to Step 4.
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 key reminder switch should be normal.

STEP 4. Check the wiring harness between key reminder 
switch connector D-202 (terminal 4) and ground.

NOTE: Also check joint connector D-30 for loose, corroded, or 
damaged terminals, or terminals pushed back in the connector. 
If joint connector D-30 is damaged, repair or replace the dam-
aged component(s) as described in GROUP 00E, Harness 
Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between key reminder switch 

connector D-202 (terminal 4) 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 key reminder switch should be normal.

AC204172

CONNECTOR : D-202

AB

HARNESS SIDE

4

5

3

1

6

7

2

D-203

AC204172

CONNECTOR : D-202

AB

HARNESS SIDE

4

5

3

1

6

7

2

D-203

AC204170

CONNECTOR : D-30

AJ

9 10

8

6 7

31 32

30

29

18 19 20 21

5

4

2

1

3

27

26

24

23

25

12 13 14 15 16 17

28

11
22
33

INPUT SIGNAL PROCEDURES

TSB Revision

SWS INPUT SIGNAL PROCEDURES

54Bc-52

STEP 5. Check key reminder switch connector D-202 and 
ETACS-ECU connector D-224 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are key reminder switch connector D-202 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 key reminder switch should be normal.

STEP 6. Check the wiring harness between key reminder 
switch connector D-202 (terminal 6) and ETACS-ECU 
connector D-224 (terminal 26).
Q: Is the wiring harness between key reminder switch 

connector D-202 (terminal 6) and ETACS-ECU connector 
D-224 (terminal 26) in good condition?
YES : Replace the ETACS-ECU. If the functions, which are 

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

AC204172

CONNECTOR : D-202

AB

HARNESS SIDE

4

5

3

1

6

7

2

D-203

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

AC204172

CONNECTOR : D-202

AB

HARNESS SIDE

4

5

3

1

6

7

2

D-203

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

INPUT SIGNAL PROCEDURES

TSB Revision

SWS INPUT SIGNAL PROCEDURES

54Bc-53

INSPECTION PROCEDURE P-2: ETACS-ECU does not receive any signal from the hazard warning 
light switch.

.

CIRCUIT OPERATION
The ETACS-ECU operates the following functions or 
systems according to signal from the hazard warning 
light switch:

• Hazard warning light

• Keyless entry system (registering the encrypted 

code)

.

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

.

TROUBLESHOOTING HINTS

• The hazard warning light 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

Hazard Warning Light Switch Input Circuit

AC204170

CONNECTOR : D-103

BD

AC204174

CONNECTOR : D-224

D-224(B)

AG

INPUT SIGNAL PROCEDURES

TSB Revision

SWS INPUT SIGNAL PROCEDURES

54Bc-54

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991502: Scan Tool (MUT-II)

STEP 1. Check the hazard warning light switch.
Remove the hazard warning light switch. Then check continuity 
between the switch terminals.

Q: Is the hazard warning light switch in good condition?

YES : Go to Step 2.
NO :  Replace the hazard warning light switch. If the 

equipment, which are described in "CIRCUIT 
OPERATION", work normally, the input signal from 
the hazard warning light switch should be normal.

STEP 2. Check the ground circuit to the hazard warning 
light switch. Test at hazard warning light switch connector 
D-103.
(1) Disconnect hazard warning light switch connector D-103 

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

(2) Measure the resistance value between terminal 2 and 

ground.

• The resistance should equal 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 5.
NO :  Go to Step 3.

SWITCH 
POSITION

TESTER 
CONNECTION

SPECIFIED 
CONDITION

Released

1 

− 2

Open circuit

Pressed

1 

− 2

Less than 2 ohms

ACX00804

AC204170

CONNECTOR : D-103

AK

1

2

4 3

HARNESS 
SIDE

D-103

AC100272

1

3 2

4

AC

CONNECTOR D-103
(HARNESS SIDE)