Mitsubishi Montero (2004+). Manual — part 813

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-509

TECHNICAL DESCRIPTION (COMMENT)
If the signal is not normal, the fog lights do not work
normally. If the signal is not normal, the fog light
switch or the ETACS-ECU may be defective.

.

TROUBLESHOOTING HINTS

• The fog 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 fog light switch.
Remove the fog light switch. Then check continuity between
the switch terminals.

Q: Is the fog light switch in good condition?

YES : Go to Step 2.
NO : Repair the fog light switch. If the for light switch

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

STEP 2. Check fog light switch connector D-127 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is fog light switch connector D-127 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

. Repair the fog light switch. If the for light

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

SWITCH
POSITION

TESTER
CONNECTION

SPECIFIED
CONDITION

Released

1

− 2

Open circuit

Pressed

1

− 2

Less than 2 ohms

ACX00797

AC204170

CONNECTOR : D-127

HARNESS SIDE

EM

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-510

STEP 3. Check the ground circuit to the fog light switch.
Test at fog light switch connector D-127.
(1) Disconnect fog light switch connector D-127 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.

STEP 4. Check the wiring harness between fog light switch
connector D-127 (terminal 2) and ground.

AC204170

CONNECTOR : D-127

HARNESS SIDE

EM

4 3 2 1

5

6

ACX01597AB

CONNECTOR D-127
(HARNESS SIDE)

AC204188

CONNECTORS : D-30, D-127

D-30

AN

HARNESS SIDE

D-127

D-30

D-127

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

2 1

4

5

3

6

INPUT SIGNAL PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-511

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 fog light switch

connector D-127 (terminal 2) and the 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 for light
switch operates normally, it indicates that a correct
signal is sent from the fog light switch.

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 for light switch operates normally, it

indicates that a correct signal is sent from the fog light
switch.

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

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-512

STEP 6. Check the wiring harness between fog light switch
connector D-127 (terminal 1) and ETACS-ECU connector
D-224 (terminal 24).
Q: Is the wiring harness between fog light switch

connector D-127 (terminal 1) and ETACS-ECU connector
D-224 (terminal 24) in good condition?
YES : Replace the ETACS-ECU. If the for light switch

operates normally, it indicates that a correct signal is
sent from the fog light 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 for light
switch operates normally, it indicates that a correct
signal is sent from the fog light switch.

AC204170

CONNECTOR : D-127

HARNESS SIDE

EM

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