Mitsubishi Montero (2004+). Manual — part 823

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-549

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.

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

AC204172

CONNECTOR: D-202

AK

HARNESS SIDE

4

5

3

1

6

7

2

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

Hazard Warning Light Switch Input Circuit

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-550

.

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

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

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.

AC204170

CONNECTOR : D-103

BD

AC204174

CONNECTOR : D-224

D-224(B)

AG

SWITCH
POSITION

TESTER
CONNECTION

SPECIFIED
CONDITION

Released

1

− 2

Open circuit

Pressed

1

− 2

Less than 2 ohms

ACX00804

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-551

STEP 2. Check hazard warning light switch connector
D-103 for loose, corroded or damaged terminals, or
terminals pushed back in the connector.
Q: Is hazard warning light switch connector D-103 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 equipment, which are described in

"CIRCUIT OPERATION", work normally, the input
signal from the hazard warning light switch should be
normal.

STEP 3. 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 4.

AC204170

CONNECTOR : D-103

AK

1

2

4 3

HARNESS
SIDE

D-103

AC204170

CONNECTOR : D-103

AK

1

2

4 3

HARNESS
SIDE

D-103

AC100272

1

3 2

4

AC

CONNECTOR D-103
(HARNESS SIDE)

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-552

STEP 4. Check the wiring harness between hazard warning
light switch connector D-103 (terminal 2) and ground.
Q: Is the wiring harness between hazard warning light

switch connector D-103 (terminal 2) 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
equipment, which are described in "CIRCUIT
OPERATION", work normally, the input signal from
the hazard warning light switch should be normal.

STEP 5. Check ETACS-ECU connector D-224 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is 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 equipment, which are described in

"CIRCUIT OPERATION", work normally, the input
signal from the hazard warning light switch should be
normal.

AC204170

CONNECTOR : D-103

AK

1

2

4 3

HARNESS
SIDE

D-103

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