Mitsubishi Montero (2002-2004). Manual — part 365

INPUT SIGNAL PROCEDURES

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SWS INPUT SIGNAL PROCEDURES

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INSPECTION PROCEDURE O-2: ETACS-ECU does not receive any signal from the ignition switch
(IG1).

.

CIRCUIT OPERATION

• The ETACS-ECU operates the following equip-

ment or functions according to signal from the
ignition switch (IG1):

• Ignition key reminder tone alarm function

• Light reminder tone alarm function

• Seat belt tone alarm function

• Power window timer function

• Seat belt warning light

• Headlight automatic shutdown function

• Turn-signal light

• Dome light dimming function

• If the power supply circuit from the battery to the

ETACS-ECU is open, this circuit is used as
backup circuit.

.

TECHNICAL DESCRIPTION (COMMENT)
If the signal is not normal, the equipment or func-
tions, which are described in "CIRCUIT OPERA-
TION", do not work normally.

.

TROUBLESHOOTING HINTS

• 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

Ignition switch (IG1) Input Circuit

AC204173

CONNECTOR : D-208

AN

AC204174

CONNECTOR : D-222

AE

INPUT SIGNAL PROCEDURES

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DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991502: Scan Tool (MUT-II)

STEP 1. Check the ignition switch (IG1) circuit to the
ETACS-ECU. Test at ETACS-ECU connector D-222.
(1) Disconnect ETACS-ECU connector D-222 and measure the

voltage available at the junction block side of the connector.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 16 and ground.

• The voltage should equal approximately 12 volts (bat-

tery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery

positive voltage)?
YES : Replace the ETACS-ECU. If the functions, which are

described in "CIRCUIT OPERATION", work normally,
the input signal from the ignition switch (IG1) should
be normal.

NO : Go to Step 2.

STEP 2. Check ETACS-ECU connector D-222 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector D-222 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 functions, which are described in

"CIRCUIT OPERATION", work normally, the input
signal from the ignition switch (IG1) should be normal.

AC204174

CONNECTOR : D-222

AB

1

2

3

5

6

4

9 8

121110

13

15 14

16

17

7

19

20

18

JUNCTION BLOCK SIDE

D-222

ACX01594

19

20

1817 1615 141312 1110 9 8 7

6 5 4 3 2 1

AB

CONNECTOR D-222
(JUNCTION BLOCK SIDE)

AC204174

CONNECTOR : D-222

AB

1

2

3

5

6

4

9 8

121110

13

15 14

16

17

7

19

20

18

JUNCTION BLOCK SIDE

D-222

INPUT SIGNAL PROCEDURES

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STEP 3. Check the wiring harness between ETACS-ECU
connector D-222 (terminal 16) and the ignition switch (IG1).

NOTE: Also check junction block connector D-208 for loose,
corroded, or damaged terminals, or terminals pushed back in
the connector. If junction block connector D-208 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 ETACS-ECU connector D-

222 (terminal 16) and ignition switch (IG1) in good
condition?
YES : No action is necessary and testing is complete.
NO : Replace the ETACS-ECU. If the functions, which are

described in "CIRCUIT OPERATION", work normally,
the input signal from the ignition switch (IG1) should
be normal.

AC204174

CONNECTOR : D-222

AB

1

2

3

5

6

4

9 8

121110

13

15 14

16

17

7

19

20

18

JUNCTION BLOCK SIDE

D-222

AC204173

CONNECTOR : D-208

HARNESS SIDE

AC

1

2

3

5

6

4

D-208

INPUT SIGNAL PROCEDURES

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INSPECTION PROCEDURE O-3: ETACS-ECU does not receive any signal from the fog light switch.

.

Fog light Switch Input Circuit

AC204170

CONNECTOR : D-30

BC

AC204170

CONNECTOR : D-127

CC

AC204174

CONNECTOR : D-224

D-224(B)

AG