Mitsubishi Montero (2002-2004). Manual - part 351

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-451

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CIRCUIT OPERATION
The ETACS-ECU illuminates the front dome light and 
the rear dome light according to the following signals:

• Ignition switch (IG1)

• Key reminder switch

• Front door switch (LH)

• All door switches

• Driver’s door lock actuator switch

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TECHNICAL DESCRIPTION (COMMENT)
If the front dome light and the rear dome light do not 
illuminate normally, the dome light bulb(s) may be 
burned out or the input circuit system from the 
switches, the power supply lines to the switches or 
the ETACS-ECU may be defective (refer to "CIR-
CUIT OPERATION"). Alternatively, the delay-off 
function may be set to "0 second" by using the con-
figuration function.

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TROUBLESHOOTING HINTS

• The key reminder switch may be defective

• The door switch may be defective

• The driver’s door lock actuator switch may be 

defective

• The dome light 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

AC204173

CONNECTORS : D-207, D-211

D-207

D-211(B)

AQ

AC204174

CONNECTOR : D-222            

AE

AC204177

CONNECTOR : F-03

AK

SYMPTOM PROCEDURES

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SWS SYMPTOM PROCEDURES

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DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set 

• MB991502: Scan Tool (MUT-II) 

• MB991862: SWS monitor kit

STEP 1. Verify the adjustment function.
Q: Is the dome light delay-off time set to "7.5 seconds," "10 

seconds," "15 seconds" or "30 seconds" by using the 
adjustment function?
YES : Go to Step 2.
NO :  Set the dome light delay-off time to "7.5 seconds," "10 

seconds," "15 seconds" or "30 seconds" by using the 
adjustment function. Verify that the dome light 
illuminates normally.

STEP 2. Verify the power supply circuit to the dome light.
Q: Does the dome light illuminate when the dome light 

switch is turned to the "ON" position?
YES : Go to Step 3.
NO :  Go to Step 8.

STEP 3. Use scan tool MB991502 to select "ECU COMM 
CHK" on the SWS monitor display.
Check the ETACS-ECU.

CAUTION

To prevent damage to scan tool MB991502, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector 

(16-pin).

(2) Connect SWS monitor kit MB991862 to the data link 

connector (13-pin).

(3) Turn the ignition switch to the "LOCK" (OFF) position.
(4) Operate scan tool MB991502 according to the procedure 

below to display "ECU COMM CHK."

1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "ECU COMM CHK."

(5) Scan tool MB991502 should show "OK" on the "ECU 

COMM CHK" menu for the "ETACS ECU" menu.

Q: Is "OK" displayed on the "ETACS ECU" menu?

YES : Go to Step 4.
NO :  Refer to Inspection Procedure A-3 "Communication 

with ETACS-ECU is impossible 

P.54Bb-25

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AC204222AB

16-pin

13-pin

MB991502

MB991862

SYMPTOM PROCEDURES

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SWS SYMPTOM PROCEDURES

54Bb-453

STEP 4. Check the input signal by using "DATA LIST" 
menu of the SWS monitor.
Turn the ignition switch to the "OFF" position before checking 
input signals from the ignition switch:
Operate scan tool MB991502 according to the procedure below 
to display "ETACS ECU."

1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "DATA LIST."
5. Select "ETACS ECU."

Check that normal conditions are displayed on the items 
described in the table below.

Q: Are normal conditions displayed on the "IG SW (IG1)"?

YES : Go to Step 5.
NO :  Refer to Inspection Procedure O-2 "ETACS-ECU 

does not receive a signal from the ignition switch 
(IG1) 

P.54Bc-7

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ITEM NO.

ITEM NAME

NORMAL 
CONDITION

ITEM 30

IG SW (IG1)

OFF

AC204222AB

16-pin

13-pin

MB991502

MB991862

SYMPTOM PROCEDURES

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SWS SYMPTOM PROCEDURES

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STEP 5. Check the input signal (by using the pulse check 
mode of the monitor.)
Check the input signals from the following switches:

• Key reminder switch

• All door switch

Operate scan tool MB991502 according to the procedure below 
to display "PULSE CHECK."

1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."

Check if scan tool MB991502 sounds or not.

Q: When the key reminder switch, each door switch and 

the interior light are operated, does scan tool MB991502 
sound in each case?
YES : Go to Step 6.
NO : 

• Scan tool MB991502 does not sound when the 

key reminder switch is operated: Refer to 
Inspection Procedure P-1 "ETACS-ECU does not 
receive a signal from the key reminder switch 

P.54Bc-49

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• Scan tool MB991502 does not sound whenever 

each door switch is operated: Refer to Inspection 
Procedure P-4 "ETACS-ECU does not receive a 
signal from all the door switches 

P.54Bc-62

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ITEM NAME

CONDITION

Key reminder switch

Remove and reinsert the 
ignition key

Each door switch

Open or close one of the doors

AC204222AB

16-pin

13-pin

MB991502

MB991862