Mitsubishi Montero (2004+). Manual - part 812

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-505

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 2) and ignition switch (ACC) 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 ignition switch (ACC) should be normal.

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

.

AC204173

CONNECTOR : D-208

HARNESS SIDE

AC

1

2

3

5

6

4

D-208

Ignition switch (IG1) Input Circuit

AC204173

CONNECTOR : D-208

AN

AC204174

CONNECTOR : D-222            

AE

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-506

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

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 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 2.
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

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-507

STEP 2. 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 3.

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

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

AC204173

CONNECTOR : D-208

HARNESS SIDE

AC

1

2

3

5

6

4

D-208

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-508

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

.

CIRCUIT OPERATION
The ETACS-ECU operates the fog lights according to 
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