Mitsubishi Montero (2002-2004). Manual - part 363

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-499

INSPECTION PROCEDURE N-3: Theft-alarm System: Headlights (high-beam) do not flash when the 
theft-alarm system is triggered.

.

TECHNICAL DESCRIPTION (COMMENT)
If the headlights (high-beam) illuminate normally, the 
front-ECU or the ETACS-ECU may be defective.

.

TROUBLESHOOTING HINTS

• The front-ECU 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

 STEP 1. Check the headlight (high-beam) operation.
Q:  Do the headlights illuminate at high beam normally?

YES : Go to Step 2.
NO :  Refer to Inspection Procedure J-3 "The headlights 

(high-beam) does not illuminate normally 

P.54Bb-

313

."

 STEP 2. Replace the ECU.
(1) Replace the ETACS-ECU.
(2) The headlights should flash at high beam when the theft-

alarm system is triggered.

Q:  Do the headlights flash at high beam when the theft-

alarm system is triggered?
YES : No action is necessary and testing is complete.
NO :  Replace the front-ECU. The headlights should flash at 

high-beam when the theft-alarm system is triggered.

INSPECTION PROCEDURE N-4: Theft-alarm System: Panic alarm function does not work.

.

TECHNICAL DESCRIPTION (COMMENT)
If the keyless entry system is normal, the ETACS-
ECU may be defective.

.

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

Panic Alarm Function

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-500

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991502: Scan Tool (MUT-II)

 STEP 1. Check the keyless entry system.
Q:  Does the keyless entry system work normally?

YES : Go to Step 2.
NO :  Refer to Inspection Procedure E-1 "Keyless entry 

system does not operate 

P.54Bb-205

."

 STEP 2. Check the input signal (by using the pulse check 
mode of the monitor.)
Check the input signals from the transmitter "PANIC" switch:

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) Operate scan tool MB991502 according to the procedure 

below to display "PULSE CHECK."

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

(3) Check that scan tool MB991502 sounds.
Q:  Does scan tool MB991502 sound when the transmitter 

"PANIC" switch is operated?
YES : Replace the ETACS-ECU. Verify that the panic alarm 

works normally.

NO :  Refer to Inspection Procedure P-10 "ETACS-ECU 

does not receive any signal from lock, unlock, trunk or 
panic switch 

P.54Bc-145

."

ACX01539

16-pin

MB991502

AI

54Bc-1

GROUP 54Bc

CONTENTS

INPUT SIGNAL CHART. . . . . . . . . . .

54Bc-2

INPUT SIGNAL PROCEDURES. . . . .

54Bc-4

INPUT SIGNAL CHART

TSB Revision

SWS INPUT SIGNAL PROCEDURES

54Bc-2

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INPUT SIGNAL CHART

M1549024200062

<SWS monitor>
If a problem is found in the Service Data inspection, 
observe the table below.

SYMPTOM

INSPECTION 
PROCEDURE

REFERENCE 
PAGE

ETACS-ECU does not receive any signal from the ignition switch (ACC). O-1

P.54Bc-4

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

P.54Bc-7

ETACS-ECU does not receive any signal from the fog light switch.

O-3

P.54Bc-10

ETACS-ECU does not receive "R" position signal from the transmission 
range switch.

O-4

P.54Bc-14

ETACS-ECU does not receive any signal from the driver's or the front 
passenger's door switch.

O-5

P.54Bc-23